Abstract
Japan has entered a transformative phase in its security orientation, shifting from its long-standing postwar model of constrained military posture toward a comprehensive, multi-domain strategy integrating defense modernization, industrial renewal, and alliance recalibration. This article argues that Japan’s current trajectory cannot be understood solely as a response to China’s rising power or North Korea’s expanding nuclear capabilities. Instead, it reflects an interaction between a rapidly deteriorating regional threat environment, new patterns of domestic political competition, elite reframing of constitutional constraints, and the embedding of national security within broader socioeconomic policy. Using evidence from official strategy documents, legislative actions, procurement records, and public statements through November 2025, the paper demonstrates how Japan’s political leadership has redefined security as a whole-of-government enterprise, thereby altering the foundations of East Asian stability and the future of U.S.–Japan alliance politics. The analysis contributes to broader debates on alliance adaptability, domestic political economy and grand strategy, and the institutional pathways through which democracies can undertake major security reforms without constitutional rupture.
Introduction
Japan’s evolving security posture has become one of the decisive developments shaping the strategic landscape of East Asia in the mid-2020s. Long regarded as a “civilian power” constrained by constitutional pacifism and dependent on the United States for extended deterrence, Japan is now engaged in a profound security realignment. The shift is neither incremental nor sector-bound. It encompasses expanded defense spending; doctrinal innovation; accelerated procurement of long-range strike capabilities; the elevation of Indo-Pacific supply chain resilience to a national security priority; and the restructuring of alliance diplomacy around more transactional, yet strategically integrated, arrangements with Washington and other partners. The implications extend well beyond the Japanese archipelago. They reshape deterrence dynamics across the Taiwan Strait, alter China’s strategic calculus, influence South Korean and Australian defense planning, and test foundational theories about how U.S. allies respond to systemic power transitions.
This article situates Japan’s security transformation within the broader literature of international relations, drawing attention to the ways domestic political economy, elite framing, and public attitudes co-evolve with external threat perceptions to produce major strategic change. Existing theories of alliance behavior often present U.S. allies as reactive or path-dependent actors whose defense policies are primarily shaped by external constraints. Japan’s experience since the early 2020s challenges that assumption. Under conditions of heightened geopolitical risk, a politicized U.S. foreign policy under the Trump administration, and intensifying Sino-American competition, Japanese policymakers have adopted a model of security statecraft that blends industrial revitalization, targeted fiscal expansion, and strategic autonomy within — rather than apart from — the framework of the U.S.–Japan alliance. This hybrid model has analytical significance for scholars of alliance politics, the domestic foundations of grand strategy, and the institutional evolution of post-pacifist Japan.
The remainder of this first section establishes the core argument and outlines the empirical foundations of Japan’s security realignment. Subsequent sections of the article will develop the causal mechanisms, assess domestic political drivers, analyze budgetary and capability trajectories, and evaluate implications for regional stability.
Japan’s Security Realignment: Context, Argument, and Stakes
Japan’s security realignment since the early 2020s represents one of the most significant transformations in its postwar strategic identity. While the country had gradually loosened certain constraints since the early 2000s — including limited reinterpretations of collective self-defense and modest Self-Defense Forces (SDF) capability upgrades — the period from 2022 to 2025 marks a decisive break. Japan now conceives of national security as a multidimensional enterprise involving defense modernization, industrial policy, fiscal strategy, and alliance diplomacy. This shift is not reducible to a single threat or partisan project. Rather, it reflects an emergent logic of national resilience under conditions of geopolitical uncertainty, economic competition, and technological fragmentation.
External Pressures and the Restructuring of Strategic Priorities
The primary external driver of Japan’s strategic shift is the rapid transformation of the regional military balance. China’s expanding naval, missile, and air capabilities have increased Tokyo’s perceived vulnerability along key maritime corridors between the East China Sea and the Western Pacific. Chinese grey-zone coercion around the Senkaku Islands, large-scale PLA exercises around Taiwan, and the institutionalization of joint Sino-Russian air patrols near Japan’s airspace have collectively narrowed the space for strategic hedging. Meanwhile, North Korea’s accelerated missile testing, including solid-fuel intermediate-range launches and demonstrations of potential maneuverable reentry vehicles, has further elevated the risk of crisis instability.
This environment has reshaped Japan’s doctrine. Strategic documents beginning in 2022 redefined deterrence to include “counterstrike capabilities,” integrated air-and-missile defense, hardened basing, and expanded munition stockpiles (Government of Japan 2022, 2023). Updated planning publicly acknowledges potential joint U.S.–Japan–Taiwan coordination in a cross-Strait contingency — a conceptual shift that would have been politically unthinkable a decade earlier. Naval and air procurement cycles, including long-range cruise missiles, hypersonics development programs, and unmanned maritime systems, reflect this doctrinal evolution (MOD Japan 2024; reporting through Nov. 2025).
Domestic Politics, Institutional Change, and Elite Leadership
Domestic political dynamics have proven equally consequential. Within the Liberal Democratic Party (LDP), once-salient divisions between traditional pacifists, gradualists, and security maximalists narrowed considerably after 2022. Elite consensus hardened around the view that deterrence failure in the Taiwan Strait or the East China Sea would directly threaten Japan’s sovereignty, economy, and energy supply chains. Political leaders in 2024–25 accelerated defense timelines, committing to reach or exceed 2 percent of GDP earlier than originally scheduled. Supplementary budgets, special investment vehicles, and targeted industrial subsidies have been deployed to fund these ambitions.
Public opinion, long a constraint on military expansion, has also evolved. Polling through late 2025 shows historically high acceptance of increased defense outlays, driven by heightened awareness of regional risks and declining confidence in long-term U.S. reliability across administrations. Rather than representing a rupture with pacifist norms, Japan’s security realignment has been framed as a protective adaptation necessary to preserve democratic autonomy in a volatile region.
Institutionally, ministries traditionally peripheral to security — such as the Ministry of Economy, Trade and Industry (METI) — have become central actors in national defense planning. The bureaucratic fusion of industrial policy, supply-chain resilience, and security preparedness represents a structural innovation in Japan’s governance model, enhancing policy coordination across sectors previously siloed.
Industrial Strategy, Economic Security, and the Return of Strategic Production
Japan’s security realignment is structurally anchored in a broader industrial transformation. Government priorities since 2023 have emphasized rebuilding advanced manufacturing ecosystems for defense-relevant technologies: semiconductors, advanced materials, propulsion systems, naval components, and AI-enabled C4ISR. Defense procurement is increasingly tied to industrial capacity building, and alliances with U.S. and European firms are designed to secure access to critical inputs while reducing vulnerability to Chinese economic coercion.
In parallel, the United States has recalibrated alliance expectations under the Trump administration’s second term, linking trade arrangements, technology transfer, and defense collaboration more explicitly than in previous decades. Washington now treats Japan not merely as a security ally but as a pivotal economic-security partner responsible for countering Chinese technological influence and absorbing new industrial responsibilities within the Indo-Pacific. Japan’s proactive embrace of this role marks a significant departure from earlier eras in which industrial and security policy remained institutionally distinct.
The domestic economic logic is clear: security revitalization creates politically durable constituencies across industry, bureaucracy, and localities. By coupling national defense with high-tech industrial revival, the Japanese government has transformed defense expansion from a politically sensitive undertaking into an electorally resonant economic program.
Implications for International Relations Theory and Regional Order
Japan’s contemporary transformation challenges several paradigms within international relations:
Alliance theory: Japan is no longer a passive “free rider” but an increasingly autonomous contributor shaping alliance strategy.
Political economy of security: The fusion of industrial policy with defense modernization suggests that advanced democracies can mobilize domestic coalitions for major strategic shifts without authoritarian coercion.
Normative constraints: Japan demonstrates that constitutional pacifism can be reinterpreted gradually through administrative and doctrinal innovation rather than formal constitutional amendment.
Regional stability: As Japan strengthens its deterrent posture, regional actors — China, South Korea, Australia, and ASEAN states — are compelled to recalibrate their own strategies, altering the broader balance of power.
Japan’s realignment therefore has system-level implications: it hardens the emerging bloc structure of the Indo-Pacific, intensifies Sino-Japanese rivalry, and introduces new uncertainties into crisis management around Taiwan and the East China Sea.
Japan’s security realignment is driven by the convergence of deteriorating regional security conditions, assertive political leadership, adaptive institutional frameworks, and a national economic strategy increasingly centered on technological and industrial resilience. The transformation is neither episodic nor reactive. It represents a durable reorientation of Japan’s strategic identity that will define the political economy and security architecture of the Indo-Pacific for decades. As subsequent sections of this paper will show, Japan’s experience offers valuable insights into how democracies navigate structural shifts in the international system, and how domestic political economy can reinforce — rather than constrain — major strategic change.
November 2025 China–Japan Crisis
The gravest test of Japan’s security realignment emerged in November 2025, when a sharp diplomatic confrontation with China escalated into the most dangerous bilateral crisis since the 2012 Senkaku/Diaoyu standoff. The episode crystallized the structural tensions underlying Japan’s strategic trajectory: a narrowing security margin in the East China Sea, Beijing’s increasingly coercive posture, Tokyo’s expanding commitments under its revised security laws, and the uncertain role of the United States in a rapidly shifting regional order. The crisis illustrated how Japan’s evolving defense strategy intersects with domestic politics, alliance management, and historical memory, reshaping both the bilateral relationship and broader Indo-Pacific deterrence dynamics.
Crisis Origins and the Dynamics of Escalation
The immediate trigger occurred on 7 November 2025, when Prime Minister Sanae Takaichi told the Diet that a Chinese attack or blockade of Taiwan could qualify as an “existential crisis” under the 2015 security legislation, thereby permitting the Self-Defense Forces (SDF) to exercise limited collective self-defense in support of the United States. Although the legislation had been debated for years, no previous prime minister had so explicitly articulated Taiwan contingency planning in existential-crisis terms. Takaichi’s remarks represented a doctrinal clarification with major strategic implications: Japan was signaling that a cross-Strait conflict could activate the most expansive interpretation of its security laws without constitutional revision.
Beijing’s reaction was immediate, vitriolic, and unprecedented in tone. The Chinese Consul General in Osaka, Xue Jian, posted comments on social media implying physical harm toward the Japanese prime minister—language Tokyo denounced as “extremely inappropriate” and threatening. Chinese Foreign Ministry spokesperson Lin Jian accused Takaichi of attempting to “interfere” in China’s internal affairs and described her remarks as an assault on the postwar international order. This rhetorical escalation demonstrated Beijing’s acute sensitivity to Japanese signaling regarding Taiwan, an issue that Chinese leaders increasingly frame as an unambiguous sovereignty matter rather than a geopolitical dispute.
The crisis intensified with a series of political statements from Beijing. On 27 November, Foreign Ministry spokesperson Guo Jiakun condemned Takaichi’s reference to the Treaty of San Francisco as “erroneous,” implicitly rejecting Japan’s legal rationale for its position on Taiwan. The exchange illustrated how longstanding legal and historical narratives remain central to the Sino-Japanese rivalry, shaping both public diplomacy and strategic discourse.
Economic Coercion as Strategic Instrument
Beijing rapidly implemented economic coercion measures, underscoring the asymmetric economic interdependence that persists despite Tokyo’s recent diversification efforts. China issued a travel advisory discouraging Chinese citizens from visiting Japan, leading to the cancellation of approximately 490,000 flight bookings—an immediate blow to Japan’s tourism sector. Chinese tourists numbered about 5.7 million in 2025, constituting nearly 23 percent of total foreign visitors. Few measures could have inflicted more direct political and economic pain on Japan’s service economy.
Beijing also reinstated its ban on Japanese seafood imports, compounding the economic fallout from domestic dislocation following the Fukushima water-release controversy. Given that China purchased roughly $125 billion in Japanese goods in 2024—including key industrial inputs, transport equipment, and semiconductor machinery—the potential for escalation remained significant. Although Beijing exercised restraint in avoiding sanctions on high-tech goods, its selective measures demonstrated its willingness to impose costs while maintaining flexibility for future leverage.
The crisis revealed the strategic logic underlying China’s economic statecraft: targeted coercion designed to inflict short-term pressure, generate domestic political scrutiny of Japanese leaders, and signal that Tokyo’s alignment with U.S. Taiwan policy would trigger tangible costs. It also showed that Japan’s economic vulnerabilities remain pronounced despite diversification initiatives embedded in its economic security strategy.
Military Signaling and Maritime Pressure
Military activity in the East China Sea escalated sharply. Chinese Coast Guard vessels increased the frequency and duration of incursions into the contiguous zone surrounding the Senkaku/Diaoyu Islands. Drones were reportedly flown near Yonaguni, Japan’s westernmost inhabited island and a critical surveillance node for monitoring PLA naval movements. December exercises saw up to 90 Chinese naval, coast guard, and militia vessels operating between the South China Sea and the Ryukyu Islands, rehearsing operations consistent with blockade tactics, maritime interdiction, and joint forces coordination.
Although no direct military confrontation occurred, the exercises underscored Beijing’s ability to generate crises at multiple maritime points simultaneously, complicating Japan’s force-planning and stretching the operational capacity of both the SDF and the Japan Coast Guard. For Tokyo, the demonstration vindicated its push for hardened facilities in the Nansei Islands chain and reinforced its shift toward long-range strike and distributed defense capabilities.
Historical Memory, Identity Politics, and the Interpretive Frame
The depth of historical grievance remains central to Beijing’s interpretation of contemporary Japanese actions. Professor Jeffrey Sachs, reflecting a widespread view in Chinese discourse, emphasized the legacy of Japan’s imperial expansion, its colonization of Taiwan and Korea, and its atrocities during the 1930s and 1940s. The Chinese embassy explicitly linked current tensions to historical precedents, citing the 1931 Mukden Incident as an example of Japan allegedly invoking “existential crisis” rhetoric to justify military aggression.
Such arguments highlight the asymmetry in memory politics: while Japan’s political establishment emphasizes forward-looking strategic needs, Chinese officials routinely embed contemporary disputes within a narrative of unatoned historical trauma. This divergence complicates diplomatic crisis management, as signaling becomes entangled with deep-seated identity narratives. Moreover, Chinese references to the enemy-state clauses of the UN Charter—an archaic but symbolically powerful legal instrument—reflect Beijing’s willingness to revive historical framing to delegitimize Japan’s security assertiveness.
Japan’s Security Rationale: Geography, Vulnerability, and Alliance Obligations
Japan’s strategic calculus rests on structural geographic facts. At its closest point, Japan lies 70 miles from Taiwan. A major PLA campaign could threaten the sea lines of communication (SLOCs) through which Japan receives most of its liquefied natural gas, petroleum, and key industrial materials. Tokyo’s vulnerability to shipping insurance disruptions, cyberattacks, and shock transmission through global energy markets makes a cross-Strait conflict an existential risk even without direct military attack on Japanese territory.
Takaichi’s remarks therefore reflect continuity rather than departure. Shinzo Abe’s 2021 statement—“a Taiwan contingency is a Japanese contingency”—long signaled elite consensus across the conservative policy establishment. Japan’s strategic thinking is shaped not by ideological hostility toward China but by structural exposure to regional instability and the recognition that U.S.–Japan alliance dynamics would make neutrality impossible in a major Taiwan conflict.
U.S. Alliance Dynamics and Strategic Triangulation
The United States’ role in the crisis revealed the complexities of alliance diplomacy under renewed U.S.–China engagement. On 24 November 2025, Presidents Xi Jinping and Donald Trump held a lengthy call emphasizing historical cooperation against fascism and affirming the importance of stabilizing bilateral ties. According to Chinese readouts, Trump acknowledged the sensitivity of the Taiwan issue—language widely interpreted in Tokyo as a sign of strategic ambiguity, if not accommodation.
Trump’s subsequent silence on the Japan–China dispute underscored growing anxieties in Tokyo and Taipei regarding U.S. reliability. Although Prime Minister Takaichi spoke with Trump on 26 November, the call’s substance remained opaque, reinforcing concerns that Washington might prioritize U.S.–China détente over alliance solidarity. Scholars such as Dennis Wilder argued that Trump’s silence produced strategic uncertainty at precisely the moment when clear communication was most essential.
Professor Sachs offered a more pointed critique: the United States, he suggested, should discourage Japanese escalation and prevent alliance dynamics from generating unnecessary confrontation. His argument reflects a broader school of thought emphasizing restraint and warning against entrapment risks. Whether or not Washington shares this view, the crisis revealed the growing divergence between Japanese threat perceptions and U.S. crisis-management preferences.
Trump’s announcement of an upcoming April 2026 visit to Beijing, followed by an anticipated Xi visit to Washington, reinforced the impression that U.S.–China stabilization, rather than alliance reassurance, was the administration’s top priority.
Crisis Durability, Political Incentives, and Prospects for De-escalation
Analysts broadly agree the crisis is unlikely to resolve quickly. As David Boling and Jeremy Chan observed, Takaichi cannot retract her statement without signaling weakness, while Beijing has strong incentives to punish what it perceives as a precedent-altering shift in Japanese policy. Tobias Harris similarly argues that both sides remain locked into positions from which significant concessions would carry high political and reputational costs.
Takaichi’s high public approval rating—69 percent—gives her political space to resist pressure and may even strengthen her domestic legitimacy. For Beijing, Taiwan remains a core interest from which no deviation is tolerable. The combination of these factors suggests a prolonged period of tension similar to China’s responses to South Korea (THAAD) and Australia (trade disputes), where coercive measures extended for years despite the absence of major political concessions.
The weight of evidence indicates that while the likelihood of military conflict remains low—given both countries’ interest in avoiding escalation—the prospects for substantial diplomatic improvement are equally limited. The crisis thus appears likely to become a durable feature of the regional environment.
Additional Regional Tensions: Japan–South Korea Relations
The November 2025 crisis also intersected with ongoing frictions in Japan–South Korea relations. Early that month, Japan revoked refueling permission for a South Korean aerobatic team, prompting Seoul to cancel a planned joint maritime exercise. The incident reflected the fragile nature of trilateral cooperation despite efforts by Washington to promote deeper coordination among its Northeast Asian allies.
Historical grievances, territorial disputes over Dokdo/Takeshima, and divergent threat perceptions continue to constrain defense cooperation. Although the 2023 Camp David agreements created a framework for trilateral alignment, events in late 2025 demonstrated the persistence of bilateral distrust, complicating U.S. strategic planning for the Indo-Pacific.
Critical Analysis: Interpreting Professor Sachs’s Perspective
In light of the evolving security landscape, the warnings offered by Professor Jeffrey Sachs (2025) deserve serious consideration. Sachs argues that Japan’s shift toward greater military orientation — expanding defense expenditures, adopting more hawkish postures, and normalizing talk of potential conflict — represents not a rational response to external threats but a dangerous turn that undermines long-term peace and stability. According to Sachs, this militarization revives patterns associated with imperialism and risks provoking regional antagonism rather than deterring it (Sachs 2025). In what follows, I assess the strengths and limitations of Sachs’s critique. I then examine additional structural constraints — fiscal, political, normative — that add complexity to Japan’s security realignment, and conclude by arguing that Tokyo faces a durable trilemma whose resolution will shape the future of Indo-Pacific security.
The Sachs Argument: Moral and Normative Reservations
Sachs frames Japan’s militarization as “anachronistic,” rooted in a legacy of imperial-era aggression and colonial expansion. He argues that political leaders today, including the current prime minister, exploit nationalist rhetoric and historical amnesia for short-term domestic advantage. Sachs contends that such a course undermines regional trust, deepens historical grievances, and may provoke a security dilemma rather than stabilize the region (Sachs 2025). His call for great-power reconciliation — invoking the shared WWII alliance among the United States, the Soviet Union (Russia), Britain, and China — serves as a moral and historical appeal for renewed cooperative order over competitive arms buildups.
Sachs’s critique puts its finger on one of the core dilemmas facing post-pacifist Japan: even institutional and doctrinal changes that stop short of formal constitutional revision carry symbolic weight. They revive anxieties among neighbors about a revived Japanese militarism, especially when domestic political rhetoric includes references to “existential threats” and collective self-defense in a Taiwan contingency. This normative dimension cannot be dismissed: it constrains Japan’s ability to achieve security on purely technical or strategic terms. Sachs’s warnings serve as an important corrective to overly technocratic accounts of capability building — reminding us that strategic choices always carry historical and symbolic costs.
Structural Constraints and Strategic Risks Beyond Normative Concerns
While Sachs draws attention to legitimate normative and historical risks, a narrow focus on moral-historical arguments overlooks several pressing structural constraints and strategic trade-offs inherent in Japan’s realignment.
Fiscal Sustainability
Japan today confronts severe fiscal constraints. With public debt exceeding 240 percent of GDP and interest rates rising after decades of ultra-low monetary policy, the sustainability of simultaneous defense modernization, industrial stimulus, and social welfare commitments is deeply uncertain. Large-scale defense procurement, prolonged procurement cycles, and expensive maintenance costs risk crowding out other essential public investments — even more so in an aging society with shrinking tax bases. Without careful fiscal management, the ambitious build-up could produce long-term macroeconomic stress, undermining both social cohesion and domestic support for defense expansion.
Domestic Political Opportunism and Short-Termism
As Sachs suggests, domestic political incentives may drive aggressive security rhetoric. In a minority or coalition government context, political leaders benefit from appearing strong on defense to shore up their base. Prime Minister Takaichi’s comfortable approval ratings may reduce the electoral cost of confrontational foreign policy, but they also raise the risk that strategic decisions are driven more by short-term political expediency than sober long-term calculation. Such dynamics can lead to overcommitment, strategic signaling prone to miscalculation, and heightened systemic friction — especially when decision-making timelines compress under electoral pressure.
Historical Memory and Regional Distrust
Sachs is correct that Japan’s historical legacy remains a powerful factor shaping China, Korea, and broader regional perceptions. Even absent formal constitutional change, the expansion of Japan’s military posture — especially its framings of possible intervention in Taiwan — reawakens fears of resurgent Japanese militarism. The repeated visits by Japanese leaders to controversial sites, such as the Yasukuni Shrine, continue to erode trust. These memory politics exacerbate the likelihood of misperceptions, miscalculation, and protracted distrust, regardless of Tokyo’s actual strategic intentions.
Uncertain U.S. Commitments and Alliance Ambiguity
The November 2025 crisis underscored the growing uncertainty about Washington’s priorities. While the U.S.–Japan alliance remains formally intact, the current U.S. administration’s strategic ambiguity — reflected in public silence in the crisis’s aftermath — increases the risk of entrapment or abandonment. As Sachs advises, a cautious U.S. posture might have discouraged escalation; instead, mixed signals may embolden Tokyo while reassuring Beijing. This ambiguity undermines deterrence credibility, complicates alliance planning, and raises the cost of potential commitments.
The Trilemma: Facing Fiscal Limits, Domestic Politics, and Strategic Necessity
Taken together, these structural constraints converge to form a strategic trilemma for Japan:
Fiscal constraints versus defense ambitions — maintaining social welfare commitments while funding expensive military modernization.
Domestic political pressures versus long-term stability — short-term electoral incentives may encourage aggressive signaling even when they increase long-term risk.
Security obligations versus normative and diplomatic costs — balancing the need for credible deterrence and alliance burden-sharing against the risk of reviving historical grievances and fueling regional militarization.
Unlike a simple trade-off, this trilemma is dynamic and recursive: policy choices in one domain (e.g., increased defense spending) affect or exacerbate tensions in the others (e.g., fiscal strain, regional distrust, alliance ambiguity).
Why Great-Power Cooperation — Sachs’s Alternative — Appears Increasingly Improbable
Sachs’s vision of renewed great-power cooperation, grounded in shared WWII history, is compelling as a normative ideal. However, current trajectories in strategic competition, alliance architecture, and domestic political alignments make such outcomes increasingly unlikely. Structural incentives push major powers toward competitive security strategies, industrial decoupling, and alliance consolidation rather than multilateral trust-building. Japan’s efforts to assert strategic autonomy within an alliance framework, combined with China’s coercive posture and U.S. domestic priorities, render a revived wartime-style great-power alignment untenable. As such, Sachs’s vision, though morally appealing, lacks credible entry points under present conditions.
Macroeconomic Performance and Structural Challenges
Japan's economy contracted 0.4% quarter-on-quarter in Q3 2025, marking the first contraction in six quarters, with an annualized decline of 1.8%. While this contraction proved less severe than forecast, it stands to reason to surmise that the underlying dynamics reveal persistent vulnerabilities. Private residential investment plunged 9.4%, dragging overall private demand down 0.4%, though public consumption provided modest support.
Inflation excluding fresh food reached 2.9% in September 2025, declining from a May peak of 3.7%, with food prices contributing over half of the price increases during the year. The weight of evidence indicates that despite nominal wage gains amid tight labor markets, real purchasing power continues to erode, constraining household consumption. GDP growth projections stand at 1.0% for 2025, moderating to 0.6% in 2026 as full-year tariff effects materialize.
Japan's demographic trajectory exacerbates these challenges. The balance of probabilities suggests that deaths exceeding births by more than a two-to-one ratio intensifies labor shortages and places mounting pressure on health and social expenditure systems designed for a younger population structure.
Monetary Policy Transition and Financial Markets
The Bank of Japan maintains its policy rate at 0.50%, following a January 2025 increase that marked the highest level in 17 years. Governor Kazuo Ueda raised the core consumer inflation forecast for fiscal 2025 to 2.7%, up from 2.2% projected in April, signaling persistent inflationary pressures despite economic weakness.
It stands to reason to surmise that this monetary normalization, while necessary to anchor inflation expectations, creates significant fiscal pressures. Policy board member Kazuyuki Masu indicated in late November that the Bank of Japan is "nearing" a decision to raise interest rates, potentially at the December or January meetings, suggesting continued tightening despite economic fragility.
Fiscal Expansion and Debt Sustainability
The Takaichi cabinet approved a record-breaking stimulus package totaling 42.8 trillion yen ($273.77 billion) in late November 2025, the largest fiscal expansion since the Covid-19 pandemic. The package includes a 17.7 trillion yen supplemental budget designed to tackle rising living costs, invest in strategic sectors including shipbuilding and semiconductors, and increase defense spending.
The weight of evidence indicates serious fiscal sustainability concerns. Japan maintains gross government debt estimated at 248.7% of GDP, the highest among advanced economies. The supplementary budget boosts defense spending by over 1 trillion yen, raising total defense expenditure to 2% of GDP for fiscal year 2025, advancing the original 2027 target by two years. Critics contend that the massive stimulus lacks sufficient focus on structural reforms addressing productivity enhancement and digitalization, prioritizing short-term political objectives over long-term economic resilience.
Domestic Political Dynamics
Leadership Transition and Coalition Instability
Sanae Takaichi assumed office as Japan's first female Prime Minister and leader of the Liberal Democratic Party (LDP) in October 2025, following a period of diminished public support due to funding scandals and poor electoral performance. Her approval ratings reached 69% as of mid-November 2025, among the highest in Japanese history, providing substantial political capital for her assertive policy stance.
However, Takaichi governs under challenging structural constraints. The balance of probabilities suggests that her firm stance on Taiwan prompted the Komeito party to withdraw from the LDP coalition, leaving her administration as a minority government. This configuration necessitates greater concessions to opposition parties to pass key legislation, potentially leading to further fiscal loosening and complicating policy coherence.
Policy Orientation and Political Strategy
Takaichi advocates what she terms "proactive" fiscal policy aimed at stimulating economic growth, arguing that a strong economy is prerequisite for sound fiscal policy. Her focus on the debt-to-GDP ratio represents a departure from previous governments that prioritized achieving primary budget surpluses. The weight of evidence indicates that this approach, while politically popular, tests the limits of investor confidence in Japanese government bonds, particularly as interest rates normalize.
The stimulus package aims to boost GDP by 1.4%, projecting an economic uplift of 24 trillion yen, though skeptics question whether expanded public spending can meaningfully lift private consumption amid persistent real wage declines and demographic headwinds.
Conclusion
The November 2025 China–Japan crisis crystallized the dilemmas at the heart of Japan’s ongoing security realignment. While concerns expressed by Professor Sachs draw necessary attention to the moral, historical, and normative risks of militarization, they do not fully account for the complex structural constraints — fiscal fragility, political opportunism, alliance uncertainty, and strategic necessity — that shape Tokyo’s decisions. Japan is not simply replaying imperial-era militarism; rather, it is navigating a volatile security environment, constrained domestic conditions, and evolving alliance dynamics.
Ultimately, the trilemma described above — balancing fiscal sustainability, domestic politics, and strategic threats — defines the parameters within which Japan must operate. Unless Tokyo achieves durable solutions across these domains — for example, through sustainable fiscal planning, cautious strategic signaling, revived regional diplomacy, and renewed alliance clarity — the November 2025 crisis may not remain an isolated incident. Instead, it may mark the beginning of a more volatile, structurally competitive phase in Sino-Japanese relations. Further scholarly attention should focus on how Japan manages this trilemma in the coming years, and whether domestic institutions or external pressures will force a recalibration of its security trajectory.