The Collapse of the Persian Gulf Cooperation Council Unity and the Emergence of Competing Proxy States
The geostrategic landscape of the Arabian Peninsula has undergone a seismic transformation in December 2025. What began as tactical divergence between Saudi Arabia and the United Arab Emirates over Yemen policy has escalated into direct kinetic confrontation, exposing fundamental rifts within the Persian Gulf Cooperation Council architecture. The December 30 Saudi airstrikes against UAE-supplied military equipment at Mukalla port represent not merely a policy disagreement but a threshold crossing in relations between two powers that collectively control trillions in global assets and anchor American security strategy in the Persian Gulf.
This analysis examines the multilayered dimensions of this crisis: the military offensive that rewrote Yemen's territorial map, the strategic calculations driving Riyadh and Abu Dhabi's divergent visions, the transnational implications for regional stability, and the profound challenges this fragmentation poses to Western policy frameworks predicated on the the Persian Gulf Cooperation Council unity.
I. Operation Promising Future: The STC's Territorial Consolidation
A. The December Offensive and Rapid Territorial Gains
On December 2, 2025, the Southern Transitional Council launched "Operation Promising Future," a coordinated military campaign that shattered the three-year stalemate in southern Yemen. The offensive's speed and scope caught regional observers off guard, suggesting months of clandestine preparation and logistical positioning.
Territorial Breakthrough in Hadhramaut Valley: Within 48 hours of initiating operations, STC forces captured Seiyun, the regional capital of Hadhramaut Governorate and Yemen's largest province by area. The city fell with minimal resistance as units from the Yemeni government's First Military Region Command either withdrew or surrendered their positions without significant engagement. By December 4, STC forces had seized the PetroMasila oil facility, Yemen's largest petroleum company, effectively gaining control over infrastructure representing approximately 80% of Yemen's modest oil reserves.
Expansion into Al-Mahrah: The offensive continued eastward into Al-Mahrah Governorate, a strategic territory bordering Oman. By mid-December, the STC controlled most of the governorate's key infrastructure, including border crossings and coastal access points. This expansion gave the STC effective control over approximately 52% of Yemen's total territory, encompassing nearly the entire geographical footprint of the former People's Democratic Republic of Yemen (South Yemen), which existed as an independent state from 1967 to 1990.
Military Capability Assessment: The STC demonstrated qualitative improvements in its military effectiveness that distinguish this offensive from previous engagements. Open-source intelligence and battlefield footage confirmed the deployment of Chinese-manufactured AH-4 155mm howitzers, providing the STC with artillery range and precision capabilities that substantially outmatch government forces' Soviet-era equipment. Additionally, hundreds of UAE-supplied modern armored vehicles enabled rapid maneuverability across Hadhramaut's vast desert terrain, allowing STC forces to outpace potential defensive responses.
B. The Collapse of Government Resistance
The near-total absence of sustained military resistance from government forces requires explanation beyond simple military superiority. Several interrelated factors contributed to this collapse:
Command Paralysis: Presidential Leadership Council Chairman Rashad al-Alimi issued no public statements during the initial 72 hours of the offensive and did not order First Military Region forces to mount defensive operations. This command vacuum created confusion among field commanders regarding engagement protocols and strategic priorities.
Saudi-Trained Force Dissolution: The Saudi-trained National Shield Forces, intended as a reliable counter to both STC expansion and Houthi threats, largely melted away without engagement. This dissolution suggests either insufficient institutional cohesion or tacit understanding that resistance would be futile given broader strategic calculations.
Tribal Calculations: Local tribal leadership in Hadhramaut, traditionally aligned with Saudi Arabia through patronage networks, made rapid assessments of shifting power dynamics. Many concluded that accommodation with the STC represented a more viable path than resistance on behalf of an increasingly hollow central government.
C. Economic and Resource Control
The STC's capture of oil infrastructure fundamentally alters Yemen's economic equation. PetroMasila's production suspension has created acute energy shortages in government-controlled areas while simultaneously providing the STC with decisive leverage over any future revenue-sharing arrangements. Control over 80% of Yemen's oil reserves positions the STC to establish de facto economic independence from any central authority, creating facts on the ground that will be extraordinarily difficult to reverse through diplomatic processes alone.
II. The Mukalla Strike: Threshold Crossing in the Persian Gulf Cooperation Council Relations
A. The Events of December 30, 2025
The crisis reached its inflection point when the Royal Saudi Air Force conducted airstrikes targeting military cargo at Mukalla port. Saudi military intelligence had tracked two vessels originating from the UAE port of Fujairah. According to coalition statements, the ships disabled their Automatic Identification Systems upon departure and arrived at Mukalla between December 28-29, unloading significant quantities of military equipment.
Target Profile: The Saudi-led coalition identified the primary vessel as the Greenland, a roll-on/roll-off cargo ship flagged under St. Kitts. Maritime tracking data confirmed the vessel's presence in Fujairah on December 22 and arrival in Mukalla on December 27. The cargo reportedly included Chinese AH-4 howitzers, advanced armored vehicles, and substantial quantities of ammunition specifically calibrated for systems already in STC possession.
Saudi Justification: The Saudi Press Agency statement characterized the weapons as constituting "an imminent threat" and "an escalation that threatens peace and stability." Saudi Foreign Ministry officials went further, directly linking the UAE to pressure on the STC to conduct military operations near Saudi borders, framing Emirati actions as threatening to Saudi national security—language typically reserved for adversaries, not allies.
Immediate Aftermath: Within hours of the strike, PLC Chairman al-Alimi delivered a televised address ordering all UAE forces to leave Yemen within 24 hours, canceling the bilateral defense agreement with the UAE, announcing a 72-hour air, land, and sea blockade on STC-held territories, and declaring a 90-day state of emergency. This represented the most direct repudiation of UAE involvement in Yemen since the 2015 coalition formation.
B. The UAE Response and Strategic Withdrawal
The UAE's initial response denied any weapons transfer, stating that vehicles unloaded at Mukalla were intended for UAE forces operating in Yemen and that "high-level coordination" with Saudi Arabia had occurred regarding the shipment. However, this account contradicted Saudi intelligence assessments and failed to explain why vehicles designated for UAE forces would be unloaded at a port under STC control rather than areas with actual UAE military presence.
By late December 30, the UAE Ministry of Defense announced it would "voluntarily" withdraw its remaining counterterrorism units from Yemen. This strategic repositioning serves multiple functions: it provides diplomatic cover for de-escalation with Riyadh, removes the minimal remaining formal UAE military presence while leaving intact the 90,000-strong STC forces that remain loyal to Abu Dhabi, and positions the UAE to claim it has responded to Saudi concerns while fundamentally preserving its strategic position in southern Yemen.
III. Strategic Divergence: Incompatible Visions for Yemen's Future
The crisis reflects fundamentally incompatible strategic objectives between Saudi Arabia and the UAE, each flowing from distinct threat perceptions and regional priorities.
A. The Saudi Strategic Framework
Border Security Imperative: Saudi Arabia shares a 1,458-kilometer border with Yemen, with Hadhramaut and Al-Mahrah governorates comprising a significant portion of this frontier. Riyadh's strategic calculus prioritizes border stability above all other considerations. The presence of 20,000 highly mobile, UAE-equipped STC fighters along this border represents an unacceptable security vulnerability from the Saudi perspective. Historically, Saudi Arabia managed this border through patronage of local tribes and support for a weak but unified Yemeni government—a formula that the STC's consolidation has now disrupted.
Political Unity Doctrine: Saudi Arabia has consistently advocated for a unified Yemeni state under the Presidential Leadership Council framework. This position reflects both ideological commitment to territorial integrity and practical calculation that only a unified (albeit weak) Yemeni government provides a viable negotiating partner for eventual peace talks with the Houthis. A fragmented Yemen complicates Saudi efforts to achieve a durable settlement that secures its southern border from Houthi threats.
Credibility Costs: Saudi Arabia's inability to protect its Yemeni allies from STC advances imposes significant credibility costs. Tribal leaders who accepted Saudi patronage now question Riyadh's capacity to fulfill security commitments, potentially undermining future influence operations throughout the Arabian Peninsula.
Military Response Posture: As of late December, Saudi Arabia had amassed 15,000-20,000 troops along the Yemen border, signaling credible threat of ground intervention should the STC refuse to withdraw from recently captured territories. This troop concentration represents the most significant Saudi military deployment to the Yemen border since the initial 2015 intervention.
B. The UAE Strategic Framework
Maritime Hegemony Priority: The UAE's strategic interests in Yemen center overwhelmingly on maritime access and control. The Bab al-Mandab Strait, through which approximately 10% of global seaborne trade and significant energy shipments transit, represents a chokepoint of supreme strategic value. By backing the STC's control of southern coastal areas, the UAE positions itself to influence shipping patterns, project naval power into the Red Sea and Gulf of Aden, and maintain strategic depth against both Iranian influence and Islamist movements.
Ideological Anti-Islamism: Abu Dhabi views the Yemen conflict through an ideological lens focused on countering the Muslim Brotherhood and affiliated Islamist movements. The UAE considers the Al-Islah party, a major component of the Saudi-backed government and closely aligned with the Muslim Brotherhood, as a fundamental threat. By empowering the STC, which explicitly positions itself as secular and opposed to Islamist governance, the UAE advances its broader regional campaign against political Islam.
Resource Access and Economic Zones: The STC's control over port cities including Aden, Mukalla, and potential access to Al-Mahrah's undeveloped port infrastructure provides the UAE with economic and logistical advantages. These ports can serve as transshipment points, naval facilities, and economic zones integrated into UAE commercial networks.
Proxy State Model: The UAE's approach in Yemen mirrors its broader regional strategy of empowering non-state actors and sub-national entities that serve Emirati interests while maintaining plausible deniability. This model, observed in Libya with support for Khalifa Haftar, in Somalia through backing of Puntland and Somaliland authorities, and now in Yemen with the STC, allows the UAE to project influence without the costs and visibility of direct military occupation.
Permanent Fragmentation as Acceptable Outcome: Unlike Saudi Arabia, the UAE appears to have concluded that Yemen's permanent fragmentation serves Emirati interests. A weak or failed central government eliminates potential opposition to UAE influence in the south while preventing any unified Yemeni state from challenging the Persian Gulf maritime dominance.
IV. The Israel-UAE Dimension: Abraham Accords as Strategic Divergence Point
The UAE's normalization with Israel through the 2020 Abraham Accords introduces a critical dimension to the Saudi-UAE rift that extends beyond Yemen. This relationship represents both a strategic asset for Abu Dhabi and a complicating factor in the Persian Gulf Cooperation Council unity, particularly regarding Saudi Arabia's own calculations about regional leadership and relations with Israel.
A. The UAE-Israel Strategic Partnership
Since signing the Abraham Accords on September 15, 2020, the UAE and Israel have developed what analysts describe as a "Dynamic Security Regime"—a relationship characterized by deep defense cooperation, intelligence sharing, and economic integration that has proven remarkably resilient despite regional turbulence.
Defense and Intelligence Cooperation: The UAE-Israel relationship has evolved into one of the most substantive security partnerships in the Middle East. Israel has supplied the UAE with advanced defense systems including Barak air-defense batteries deployed in 2022, SPYDER mobile air-defense systems, and intelligence-gathering capabilities. In 2021 alone, the UAE and Bahrain purchased over $853 million in arms from Israel, with defense exports reaching record levels. The relationship proved operationally significant during the April and October 2024 Iranian missile attacks on Israel and the 12-day Israel-Iran war in June 2025, when coordination through U.S. CENTCOM integration provided crucial defensive capabilities.
Economic Integration: Trade between the UAE and Israel surged from virtually nothing in 2019 to approximately $3 billion annually by 2023-2024. The UAE earmarked $10 billion in investments in Israel's strategic sectors including energy, manufacturing, and healthcare. Over 500 Israeli companies established presence in the UAE by 2022, with projections suggesting this number would double. The relationship enabled establishment of a land route for Israeli goods through Jordan and Saudi Arabia to bypass Houthi attacks in the Red Sea, demonstrating how Israel-UAE ties reshape regional logistics.
Technology Transfer and Industrial Cooperation: Beyond simple arms purchases, the UAE has pursued sophisticated technology transfer agreements. The proposed Hermes 900 UAV deal with Elbit Systems includes phased technology transfer leading to eventual domestic production by UAE's EDGE Group, exemplifying Abu Dhabi's strategy of transforming from importer to manufacturer. This aligns with UAE's 2025-2028 strategic plan to strengthen its indigenous defense sector while providing Israel expanded access to the Persian Gulf defense markets.
B. Tensions and Red Lines
Despite this deep cooperation, the relationship has faced significant strains, particularly over Israeli policies toward Palestinians:
West Bank Annexation Warning: In August-October 2025, UAE officials issued unprecedented public warnings that Israeli annexation of West Bank territories would constitute a "red line" that could fundamentally damage the Abraham Accords. Lana Nusseibah, UAE Special Envoy and former UN Ambassador, stated such moves would "foreclose the idea of regional integration and be the death knell of the two-state solution." This marked the first time the UAE explicitly threatened consequences for Israeli policy decisions since normalization.
Gaza War Complications: The October 7, 2023 Hamas attack and subsequent Gaza conflict created substantial political pressures on the UAE's relationship with Israel. Public opinion in the UAE and broader Arab world turned sharply against normalization, though the government maintained diplomatic relations and continued defense cooperation. In October 2025, Dubai Airshow organizers announced Israeli defense companies could not participate—a decision reflecting growing political sensitivities even as underlying security cooperation continued.
Divergent Iran Strategies: A fundamental strategic divergence has emerged: Israel has pursued a maximalist military approach toward Iran and its regional proxies, while the Persian Gulf Cooperation Council states including the UAE have prioritized stability and sought to normalize relations with Tehran. This creates tension between the UAE's security partnership with Israel and its desire to reduce regional temperature and protect economic interests.
C. The Saudi Position: Outside Looking In
Saudi Arabia's relationship with the Abraham Accords framework creates a complex triangular dynamic:
Strategic Isolation: While the UAE normalized relations with Israel in 2020 and developed deep security ties, Saudi Arabia has remained outside the Abraham Accords despite extensive discussions. This positions Riyadh in the awkward position of watching its primary the Persian Gulf Cooperation Council rival develop capabilities and relationships that enhance UAE regional standing while Saudi Arabia maintains traditional Arab League positions on Israel-Palestine relations.
Conditional Normalization: Saudi Arabia has consistently stated that normalization with Israel requires "credible, irreversible efforts towards Palestinian statehood" and a clear pathway to a two-state solution. Crown Prince Mohammed bin Salman, during his November 2025 meeting with President Trump, reiterated that while Saudi Arabia "wants to join the Abraham Accords," it needs "a clear path toward a two-state solution." This conditionality distinguishes Saudi Arabia's approach from the UAE's willingness to normalize without Palestinian preconditions.
Shifting U.S. Dynamics: The Trump administration's November 2025 approach to Saudi Arabia marked a significant shift: Washington provided Saudi Arabia with F-35 fighters, strategic security agreements, major non-NATO ally status, and critical technology partnerships without requiring Israeli normalization as a precondition. This represents a fundamental departure from previous linkage strategies and potentially removes U.S. leverage for pushing Saudi-Israeli rapprochement. As one analysis noted, "Washington's ability to condition strategic cooperation on political deliverables has diminished."
Regional Leadership Implications: Saudi Arabia positions itself as leader of the Arab and Muslim world. The UAE's independent relationship with Israel—and willingness to act on its own strategic logic rather than collective Arab positions—challenges Saudi regional leadership. If Saudi Arabia were to normalize with Israel, it would carry far greater symbolic weight across the Muslim world than the UAE's decision, but also carries greater domestic and regional political risk.
D. The Yemen Connection: How Abraham Accords Complicate the Crisis
The Israel-UAE relationship adds several layers of complexity to the Yemen crisis:
Enhanced UAE Capabilities: Israeli defense technology and intelligence support have materially enhanced UAE military capabilities, including those deployed to support the STC in Yemen. Israeli air defense systems protect UAE territory from potential Houthi retaliation, reducing the costs and risks of UAE's Yemen intervention. This technological edge, unavailable to Saudi Arabia, contributes to the military capability asymmetry between STC forces (backed by Israeli-equipped UAE) and Saudi-backed government forces.
U.S. Triangulation: The UAE's relationship with both the United States and Israel creates diplomatic advantages that Saudi Arabia lacks. When tensions with Riyadh escalate, the UAE can leverage its Abraham Accords partnership and its position as a key U.S. ally to complicate American pressure. This was evident in October 2025 when reports indicated that UAE-backed forces in Sudan received little significant U.S. pushback despite concerns about human rights violations.
Saudi Frustration Amplification: Saudi Arabia's perception that the UAE gains strategic advantages through the Abraham Accords while pursuing policies harmful to Saudi interests in Yemen and Sudan amplifies Riyadh's frustration. The December 30 Mukalla airstrikes must be understood partly as Saudi Arabia signaling that it will not tolerate UAE exploitation of these advantages at Saudi expense.
Future Saudi-Israel Normalization Complications: The Yemen crisis significantly complicates any potential Saudi-Israeli normalization. If Saudi Arabia perceives that normalization would strengthen the UAE's position by legitimizing the very capabilities and relationships Abu Dhabi uses against Saudi interests, Riyadh's incentives for normalization decline. Conversely, some Saudi strategists might view their own normalization as necessary to level the playing field with the UAE.
E. The Palestinian Question as Wedge and Constraint
UAE Flexibility vs. Saudi Constraints: The UAE's willingness to pursue normalization without resolving the Palestinian issue reflects its more technocratic, economically-focused foreign policy approach. Saudi Arabia, as custodian of Islam's two holiest sites and claiming leadership of the Arab world, faces far greater domestic and regional constraints. The UAE can frame its Israel relationship as pragmatic strategic calculation; Saudi Arabia would face charges of betraying Islamic and Arab causes.
Divergent Priorities: The UAE prioritizes containing political Islam (including Hamas and the Muslim Brotherhood), securing maritime access, and advancing economic diversification. These interests align substantially with Israel's. Saudi Arabia's priorities—border security, regional stability, managing internal religious constituencies, and maintaining Arab world leadership—create a different calculation where Palestinian cause remains central to legitimacy.
Competitive Dynamics: If Saudi Arabia eventually normalizes with Israel, it would overshadow the UAE's role as primary Arab partner and potentially shift the center of Arab-Israeli relations from Abu Dhabi to Riyadh. This creates UAE incentives to maintain its first-mover advantages and deepen its Israel relationship before potential Saudi entry dilutes its special position.
V. The Broader Context: Saudi-UAE Economic Competition and Regional Rivalry
Beyond Yemen and the Abraham Accords dimension, the December crisis reflects evolving Saudi-UAE relations across multiple economic and strategic domains.
A. Economic Competition and Vision 2030
Divergent Fiscal Realities: Saudi Arabia requires an oil price of approximately $81-82 per barrel to balance its 2025 budget, driven by massive expenditures on Vision 2030 mega-projects including NEOM, while the UAE can balance its budget at approximately $50 per barrel due to earlier diversification investments. This fiscal differential creates fundamentally different preferences regarding OPEC+ production policy and oil price targets.
Dubai vs. Riyadh Competition: Saudi Arabia's Regional Headquarters Program mandates that multinational corporations establish their Middle East regional headquarters in the Kingdom rather than traditional hubs like Dubai. This represents a direct challenge to the UAE's economic model and has created significant tension within the business communities of both nations.
Investment Allocation Pressures: Both nations have made substantial investment commitments to the United States, with the UAE pledging $1.4 trillion and Saudi Arabia committing $1 trillion to American infrastructure and technology projects. However, declining oil revenues due to price weakness have raised serious questions about the feasibility of these commitments, creating competitive dynamics over which nation can better deliver on promises to Washington.
B. OPEC+ Tensions and Market Share Competition
The Yemen crisis occurs against the backdrop of significant tensions within OPEC+ over production quotas and market strategy.
UAE Overproduction: Multiple market analysts estimate the UAE may be producing 3.3-3.4 million barrels per day, approximately 400,000-500,000 barrels above its official OPEC+ quota. This overproduction directly undermines Saudi efforts to maintain price discipline through production restraint. The UAE has invested $62 billion in expanding production capacity and has consistently lobbied for higher baseline quotas to reflect these investments.
Saudi Strategic Dilemma: Saudi Arabia faces the difficult choice between confronting UAE quota violations publicly, which risks OPEC+ fragmentation, or accepting market share erosion that undermines its own fiscal position. The Kingdom's decision to begin unwinding production cuts in 2025 may represent a shift toward prioritizing market share over price—a strategy that some analysts interpret as an attempt to discipline quota violators.
Energy Transition Positioning: Both nations recognize that peak oil demand may occur within the next decade. This reality creates incentives for the UAE to maximize current production and market share before the energy transition erodes long-term demand, while Saudi Arabia seeks to maintain price stability to fund its massive diversification investments.
C. The Sudan Parallel: Proxy Competition Across the Red Sea
The Saudi-UAE rivalry extends beyond Yemen to Sudan, where the two nations back opposing sides in that country's civil war.
UAE Support for the RSF: The UAE has provided extensive financial and military support to the Rapid Support Forces under Mohamed Hamdan Dagalo (Hemedti), including weapons, funding, and access to international gold markets for RSF-controlled mining operations. This support has enabled the RSF to achieve significant military gains despite international condemnation of human rights violations.
Saudi Support for the SAF: Saudi Arabia backs the Sudanese Armed Forces under General Abdel Fattah al-Burhan and has sought to position itself as mediator in the conflict through hosting peace talks in Jeddah. Riyadh views the Red Sea littoral as vital to its economic security and cannot accept instability or UAE-aligned militias controlling Sudan's coast.
Transregional Strategy: Analysts characterize the UAE's approach as empowering non-state actors with secessionist tendencies to secure access to strategic resources and geography. This pattern—evident in Yemen, Sudan, Libya, and Somalia—reflects a coherent regional strategy that increasingly clashes with Saudi preferences for state stability and territorial integrity.
American Diplomatic Complications: The Sudan crisis has reportedly influenced Saudi Crown Prince Mohammed bin Salman's discussions with President Trump, with Riyadh requesting not only sanctions against the RSF but also considering secondary sanctions against the UAE for its role in prolonging the conflict. These requests demonstrate the depth of Saudi frustration with UAE policies beyond Yemen alone.
VI. The Houthi Dimension: Beneficiaries of the Persian Gulf Cooperation Council Disunity
A. Houthi Consolidation in the North
While the STC and government forces clash in the south, the Iran-aligned Houthis have solidified control over northern Yemen, including the capital Sanaa and regions containing the majority of Yemen's population.
Red Sea Campaign Pause: Following an Israel-Hamas ceasefire framework in October 2025, the Houthis paused their Red Sea shipping interdiction campaign that had disrupted approximately 10% of global seaborne trade since late 2023. However, in an undated letter to Hamas published in November, Houthi leadership explicitly reserved the right to resume attacks if Israel violates the ceasefire, maintaining this leverage as a key strategic asset.
Institutional Consolidation: Despite international isolation, the Houthis have constructed parallel governance structures in areas under their control, including taxation systems, security forces, and administrative bureaucracies. This state-building project advances while Saudi attention and resources focus on managing the STC crisis.
Marib Vulnerability: The fragmentation of the anti-Houthi coalition potentially enables renewed Houthi operations against Marib, the last significant northern governorate outside Houthi control. Marib's substantial energy resources and strategic location make it a high-value target, and its loss would represent a severe blow to any residual government authority.
B. Strategic Patience and Long-Term Positioning
The Houthis have demonstrated strategic patience, recognizing that time favors their consolidation. As long as Saudi Arabia and the UAE remain focused on their mutual rivalry rather than the Houthi threat, the Sanaa-based authorities can strengthen their position without significant external pressure. This dynamic fundamentally undermines the original rationale for the Saudi-led coalition intervention in 2015.
VII. Implications for Western Policy Frameworks
A. The Fiction of the Persian Gulf Cooperation Council Unity
Western security architectures in the Middle East have long presupposed the Persian Gulf Cooperation Council unity as a foundational element. The December crisis exposes this assumption as increasingly fictional. The United States, United Kingdom, and European partners must recalibrate their approaches to recognize that Saudi Arabia and the UAE pursue fundamentally different regional strategies that may prove irreconcilable on key issues.
NATO Partnership Complications: Both Saudi Arabia and the UAE serve as crucial partners for Western military operations, counterterrorism efforts, and intelligence sharing. The public rupture between these partners complicates coordination on Iran policy, Red Sea security, counterterrorism operations, and broader Middle East stabilization efforts.
Investment Relationship Leverage: The UAE's $1 trillion in existing U.S. investments and $1.4 trillion in new commitments, combined with its position as the largest importer of U.S. goods in the Middle East and North Africa, provide Abu Dhabi with substantial leverage in Washington. This economic relationship has historically insulated the UAE from significant U.S. pressure over problematic foreign policy choices, including its role in Sudan and Yemen.
B. Maritime Security Reassessment
Gulf of Aden Risks: The concentration of competing naval and proxy forces in the Gulf of Aden and southern Red Sea increases the risk of miscalculation, accidental escalation, or intentional provocations. With Saudi and UAE-aligned forces operating in proximity, the potential for incidents that could spiral into broader conflict has increased substantially.
Commercial Shipping Vulnerabilities: Approximately 12% of global trade transits the Bab al-Mandab Strait and Red Sea corridor. While Houthi attacks have paused, the proliferation of competing armed groups and state actors in littoral areas creates new risks to commercial navigation. Insurance premiums for vessels transiting these waters may remain elevated even absent direct attacks.
C. Yemen Policy Reconceptualization
Accepting Tripartite Reality: Western policy has remained nominally committed to supporting a unified Yemen under the Presidential Leadership Council. This position has become increasingly divorced from ground realities. A more pragmatic approach would acknowledge Yemen's de facto fragmentation into three entities: the Houthi-controlled north, the STC-controlled south, and diminishing PLC remnants, and adjust diplomatic and humanitarian strategies accordingly.
Humanitarian Access Imperatives: Yemen remains one of the world's worst humanitarian crises, with 19.5 million people requiring assistance. The fragmentation of authority complicates aid delivery, as humanitarian organizations must negotiate access with multiple competing authorities. The December emergency and blockade declarations threaten to exacerbate civilian suffering significantly.
D. Saudi-UAE Mediation Requirement
Urgent Diplomatic Intervention: The deterioration of Saudi-UAE relations threatens regional stability far beyond Yemen. These two nations anchor American security strategy in the Persian Gulf, drive OPEC+ energy policy affecting global markets, and serve as counterweights to Iranian influence. High-level U.S. diplomatic engagement is required to prevent further escalation and establish guardrails for their competition.
Differentiated Engagement: Rather than treating Saudi Arabia and the UAE as an undifferentiated "Persian Gulf bloc," Western diplomacy must engage each nation based on its distinct interests and threat perceptions. Cookie-cutter approaches that assume parallel interests will fail to address the root causes of their divergence.
VIII. Scenario Analysis: Potential Future Trajectories
A. Scenario One: Managed Competition and Tacit Partition
In this scenario, Saudi Arabia and the UAE reach an implicit understanding that accepts Yemen's de facto partition. Saudi Arabia secures commitments that STC forces will not threaten border security, while the UAE consolidates control over southern coastal areas. This outcome would likely involve:
- STC withdrawal from positions directly threatening Saudi border areas while retaining control of ports and coastal governorates
- Renewed Saudi focus on securing a separate agreement with the Houthis to stabilize the northern border
- UAE provision of security guarantees regarding border management and counterterrorism cooperation
- Continued economic fragmentation with separate administrations in north and south
Probability Assessment: Moderate. This represents the path of least resistance for both parties but requires significant face-saving mechanisms for Saudi Arabia.
B. Scenario Two: Saudi Military Intervention
Should the STC refuse to withdraw from border areas or should further provocations occur, Saudi Arabia could launch a ground intervention in southern Yemen. This scenario would involve:
- Deployment of the 15,000-20,000 troops currently massed at the border
- Military operations to push STC forces away from sensitive border regions
- Risk of direct Saudi-Emirati proxy confrontation with potential for miscalculation
- International condemnation and potential U.S. pressure to de-escalate
Probability Assessment: Low to moderate. Saudi Arabia has strong incentives to avoid another costly military entanglement in Yemen, but domestic political pressures and security imperatives could push toward intervention if diplomatic solutions fail.
C. Scenario Three: Comprehensive Escalation
The worst-case scenario involves multiple simultaneous escalations:
- Continued Saudi-UAE tensions spilling over into OPEC+ collapse and oil market disruption
- Houthi exploitation of anti-Houthi coalition fragmentation to launch new offensives
- Resumption of Red Sea shipping attacks affecting global trade
- Spillover into Sudan conflict with increased proxy warfare
- Broader questioning of GCC institutional viability
Probability Assessment: Low but with catastrophic consequences if realized. Multiple circuit breakers exist to prevent this trajectory, but the interconnected nature of conflicts creates escalation pathways.
D. Scenario Four: Externally Mediated Settlement
International actors, potentially including the United States, Oman, or other parties, broker a comprehensive settlement involving:
- Recognition of Yemen's de facto tripartite division with formal autonomy arrangements
- International security guarantees for border areas
- Economic framework for sharing oil revenues
- Saudi-UAE reconciliation process addressing broader regional tensions
Probability Assessment: Low in the near term. The positions of key actors remain too divergent, and domestic political incentives favor continued confrontation over compromise.
IX. Strategic Recommendations
For Western Policymakers:
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Abandon Unity Fiction: Develop separate diplomatic tracks for Saudi Arabia and UAE engagement that recognize their divergent interests rather than forcing artificial consensus.
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Prioritize Maritime Security: Establish enhanced naval coordination mechanisms independent of fractured Persian Gulf Cooperation Council coalition structures to protect commercial shipping and prevent escalation in contested waters.
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Yemen Realism: Shift from rhetorical support for unified Yemen to pragmatic engagement with de facto authorities controlling territory, prioritizing humanitarian access and civilian protection.
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Economic Leverage: Utilize economic relationships, particularly with the UAE, to impose costs for destabilizing proxy warfare while incentivizing constructive regional engagement.
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Mediation Investment: Commit high-level diplomatic resources to Saudi-UAE reconciliation, recognizing that their relationship stability affects multiple conflicts and global economic interests.
For the Persian Gulf Cooperation Council Members:
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Institutional Preservation: Smaller GCC members (Kuwait, Oman, Qatar, Bahrain) should actively mediate between Saudi Arabia and UAE to prevent complete organizational collapse.
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Economic Coordination: Maintain OPEC+ cohesion despite political tensions, recognizing shared long-term interests in energy market stability.
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Humanitarian Priority: Agree to humanitarian corridors and aid access regardless of political disputes, preventing civilian populations from becoming leverage in inter-state competition.
For International Organizations:
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UN Mediation Enhancement: Strengthen UN Special Envoy resources and mandate to address Yemen's de facto partition reality rather than pursuing increasingly unrealistic unified government frameworks.
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Humanitarian Coordination: Establish mechanisms for aid delivery that can function across multiple competing authorities without requiring unified permission structures.
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Maritime Governance: Develop international protocols for managing competing naval and coast guard activities in the Red Sea and Gulf of Aden to prevent incidents.
X. Conclusion: A Threshold Moment for the Persian Gulf Geopolitics
The December 2025 crisis represents a threshold moment in Arabian Peninsula geopolitics. The public rupture between Saudi Arabia and the UAE, manifested in kinetic action at Mukalla port, reveals fault lines that extend far beyond Yemen to encompass economic competition, energy market strategy, proxy conflicts across multiple theaters, and fundamentally incompatible visions for regional order.
The crisis exposes several critical realities that Western policymakers must internalize:
First, the Persian Gulf Cooperation Council unity cannot be assumed as a permanent feature of Middle East geopolitics. The interests that once bound Saudi Arabia and the UAE in common cause—opposition to political Islam, containment of Iran, alignment with American security architecture—have given way to competition for regional preeminence, market share, and influence over sub-state actors.
Second, Yemen's trajectory toward permanent fragmentation appears increasingly irreversible absent dramatic shifts in regional power dynamics. The military capabilities, institutional structures, and political momentum driving the STC's consolidation in the south, the Houthis' entrenchment in the north, and the Presidential Leadership Council's hollow authority cannot be easily reversed through diplomatic processes designed for unified states.
Third, Yemen's trajectory toward permanent fragmentation appears increasingly irreversible absent dramatic shifts in regional power dynamics. The military capabilities, institutional structures, and political momentum driving the STC's consolidation in the south, the Houthis' entrenchment in the north, and the Presidential Leadership Council's hollow authority cannot be easily reversed through diplomatic processes designed for unified states.
Fifth, proxy warfare has become the dominant mode of the Persian Gulf state competition, with Yemen and Sudan serving as primary battlegrounds but with patterns likely to replicate across the Horn of Africa and potentially beyond. This approach allows the Persian Gulf powers to pursue strategic objectives while maintaining plausible deniability and avoiding direct confrontation.
Fourth, energy market dynamics will increasingly constrain the Persian Gulf states' freedom of action. Lower oil prices driven by oversupply, quota violations, and demand weakness force difficult choices between fiscal sustainability and market share. These pressures may either force cooperation or intensify competition depending on how actors assess their relative positions.
The international community faces limited options for addressing this crisis, most of them unsatisfying. The most realistic near-term objective involves preventing worst-case escalation scenarios while accepting that Yemen's reunification under a single authority appears increasingly implausible. Managing the fragmentation, ensuring humanitarian access, protecting commercial shipping, and preventing spillover effects into other regional conflicts represent more achievable, if less ambitious, objectives.
For the Yemeni people, who have endured more than a decade of devastating conflict, the December crisis offers little hope for near-term relief. The transformation of their country into a battleground for competing Persian Gulf ambitions has created immense suffering, displaced millions, and destroyed social infrastructure. The international community's inability to craft effective responses to this crisis represents not merely a policy failure but a profound moral challenge.
As 2026 begins, the Arabian Peninsula confronts a new geopolitical reality: one in which former allies operate as strategic competitors, unified states fragment into proxy territories, and the assumptions undergirding decades of Western engagement require fundamental reassessment. How regional and international actors respond to this threshold moment will shape Middle East security architecture for the remainder of the decade and beyond.