The Uncrossed Strait: Semiconductors, Sovereignty, and the Fragile Peace Across Taiwan

The Uncrossed Strait: Semiconductors, Sovereignty, and the Fragile Peace Across Taiwan

Last week, Taiwan's stock market overtook the United Kingdom's in total value, crossing the four-trillion-dollar threshold [1]. The milestone was driven almost entirely by semiconductors and the artificial intelligence boom, feeding demand for them. TSMC, Taiwan's dominant chipmaker, accounts for roughly 45% of that figure on its own, having just reported a 58% jump in quarterly profit. For a moment, the financial headlines made Taiwan sound invincible as an island so economically indispensable that no rational actor could afford to touch it. Severe disruption to global supply chains would impose high economic costs and could trigger external responses, potentially raising the risks of major conflict. Yet the silicon shield, compelling as it is, tells only part of the story.

Two Governments, One Strait

The current situation has its roots in 1949, when the Chinese Civil War ended in Communist victory on the mainland. Chiang Kai-shek's Nationalist government retreated to Taiwan, bringing with it some two million people and the claim that the Republic of China was the legitimate government of all China[2]. Since then, the two entities have faced each other across the strait, each, for much of the period, insisting it was the real China. The world gradually settled the question of international recognition in Beijing's favour. In 1971, the United Nations transferred China's seat from Taipei to the People's Republic [3]. In 1979, the United States shifted formal diplomatic recognition to the mainland. Yet Taiwan survived this diplomatic attrition, democratised through the 1990s, and built an economy whose GDP per capita now exceeds that of many Western European countries. The cross-strait relationship has oscillated between periods of genuine rapprochement, under President Ma Ying-jeou from 2008 to 2016, when direct air links, tourism flows, and a sweeping trade framework knitted the two economies closer together, and episodes of sharp confrontation [4]. Since 2022, tensions have run particularly high. China conducted large-scale military exercises explicitly simulating a blockade following Nancy Pelosi's visit to Taipei, and in December 2025, repeated the exercise under the name “Justice Mission 2025 [5].” Taiwan's current president, Lai Ching-te, elected in 2024, has shown no inclination to accept Beijing's terms for dialogue.

The Shield and Its Double Edge

Taiwan's position in advanced semiconductor manufacturing is genuinely irreplaceable in the near term. No other country has come close to replicating TSMC's fabrication processes at scale [6]. A Chinese military operation that damaged or disrupted those facilities would impose supply-chain shocks across the entire global economy, including China's own defence and technology sectors, which have relied on Taiwanese foundries for the advanced chips they cannot yet produce domestically.

China is the world's dominant supplier of rare earth elements, materials used in the machines that manufacture semiconductors. Taiwan imports 95% of its rare earth supply from China [7]. That looks, initially, like an overwhelming point of leverage. On examination, it is a double-edged instrument: aggressive restriction of rare earth exports would simultaneously threaten Taiwan's chip production capacity and China's own access to the advanced chips that production generates. The coercive tools run in both directions, and Beijing's leverage is strongest when held in reserve.

This self-constraining logic has been visible in practice. China has not attempted to rupture the economic relationship, but has calibrated pressure within it. The agricultural import bans imposed after Tsai Ing-wen's re-election in 2020, and extended following Pelosi's visit in 2022, imposed costs on Taiwan without triggering military escalation. They are the behaviour of a state that has concluded economic coercion is a more rational instrument than conquest, not because the silicon shield makes invasion impossible, but because the asymmetric economic relationship already provides usable leverage short of war.

Four Constraints in Concert

The silicon shield is one element of a larger system of constraints. Three further factors interact with it, collectively raising the expected cost of invasion well above any plausible expected benefit.

The first is ideology, and its consequences are less intuitive than they might appear. Since coming to power in 2012, Xi Jinping has built a remarkably specific public position on Taiwan: that Taiwanese people are compatriots, members of the same national family, and that reunification, when it comes, will be peaceful [8]. By constructing Taiwanese people as members of the Chinese national in-group, Xi simultaneously delegitimised coercive force as a policy instrument. An invasion producing mass Taiwanese casualties would constitute, in the terms of Xi's own official discourse, an act of violence against Chinese compatriots. The ideological commitment constrains the assertiveness it was designed to project.

The second constraint is domestic economic vulnerability. China's real estate sector, which once accounted for nearly a quarter of GDP, has been in protracted contraction since Beijing's 2020 "three red lines" policy triggered a sector-wide liquidity crisis [9]. Local government debt has risen sharply while youth unemployment remains significantly elevated above the national urban average. The CCP's governing compact has rested substantially on its ability to deliver economic performance; the regime is already managing a legitimacy deficit. A full-scale invasion that triggered international sanctions, capital flight, and a sharp recession would arrive at precisely the moment that domestic fragility makes economic disruption most politically dangerous.

The third constraint is military operational feasibility in the geography of Taiwan. The Taiwan Strait is narrow but exposed, making any crossing visible to surveillance long before landing forces arrive. Taiwan's coastline offers few beaches suitable for amphibious operations [10]. Its interior is dominated by a mountain range covering 60% of the island's territory, rising to nearly 4,000 metres, terrain that would absorb and attrit any invading force attempting to move inland. A 2023 wargame conducted by the Center for Strategic and International Studies modelled a Chinese invasion under various assumptions and found that, in scenarios where China fails, its losses are enormous: amphibious forces destroyed, thousands of soldiers captured, and naval capacity severely degraded [11]. The expected cost of failure is high enough that prudent leadership must treat it as a serious scenario rather than an acceptable risk.

These four constraints, economic entanglement, ideological self-binding, domestic vulnerability, and military feasibility, do not operate independently. They reinforce each other. Economic interdependence makes coercion rational and invasion irrational. Domestic fragility raises the cost of a war that goes wrong. Official discourse makes indiscriminate violence against “compatriots” politically illegitimate. Operational constraints make military success deeply uncertain. Each mechanism amplifies the others.

The American Variable

External deterrence adds a further layer of complexity and a significant source of uncertainty. The United States has been Taiwan's security backstop since 1950, when the Truman administration deployed the Seventh Fleet to the Taiwan Strait during the Korean War. The 1979 Taiwan Relations Act committed the US to supplying Taiwan with defensive arms and maintaining the capacity to resist coercive action, yet without legally requiring military intervention, which rests with the President [12].

The current administration has complicated any straightforward reading of US intentions. In February 2026, Donald Trump discussed weapons sales to Taiwan directly with Xi Jinping, the first time a US president had consulted a Chinese leader on that question. What signal this sends about Washington's ultimate willingness to intervene remains genuinely unclear. An unpredictable United States raises Beijing's uncertainty about the cost of miscalculation as much as it might encourage adventurism. The ambiguity is uncomfortable for Taiwan but it may nonetheless be doing deterrent work.

A Fragile Equilibrium

Taiwan's stock market now exceeds Britain's. That is, in some ways, the most vivid possible illustration of how much the world has staked on the assumption that the cross-strait status quo holds.

The status quo holds because multiple constraints interact and reinforce each other, collectively keeping the expected utility of a full-scale invasion below that of the alternatives available to Beijing. Economic entanglement makes coercion more rational than conquest. Ideology has boxed the leadership into a peaceful reunification framework that it cannot easily abandon. Domestic vulnerability means the regime cannot absorb the political and economic shock of a war that goes wrong. The geography of an amphibious crossing is genuinely forbidding. And American deterrence, however ambiguous, still raises the expected cost of miscalculation.

None of these constraints is permanent. Economic interdependence is shifting, with the United States overtaking China as Taiwan's primary export market in 2025 for the first time in a quarter century. Domestic pressures in China could accelerate or recalibrate. The American commitment, once a reliable architecture, is now a live political variable. What the analysis suggests is not that the status quo is stable but that it is held together by multiple threads, no single one of which is sufficient on its own.

Understanding those threads is the first step to understanding what might happen if any one of them breaks.

Footnotes

[1] Tim Bradshaw, Arjun Neil Alim, and Haohsiang Ko, ‘Taiwan Overtakes UK in Stock Market Value on AI Chip Boom’, Asia-Pacific Equities, Financial Times, 16 April 2026, https://www.ft.com/content/4e647b69-f130-4864-944c-3b4c0fcb1dbc?syn-25a6b1a6=1.

[2] Jon W. Huebner, ‘The Abortive Liberation of Taiwan’, The China Quarterly 110 (1987): 256–75, Cambridge Core, https://doi.org/10.1017/S0305741000019901.

[3] United Nations General Assembly, ed., Restoration of the Lawful Rights of the People’s Republic of China in the United Nations, United Nations General Assembly Resolutions, no. A/RES/2758(XXVI) (New York: United Nations, 1971), https://undocs.org/A/RES/2758(XXVI).

[4] Mitsutoyo Matsumoto, ‘Policymaking in Taiwan’s Semi-Presidentialism: A Case Study of the Economic Cooperation Framework Agreement (ECFA)’, Journal of Contemporary East Asia Studies 4, no. 2 (January 2015): 37–65, https://doi.org/10.1080/24761028.2015.11869084.

[5] ‘US Announces $11bn Weapons Sale to Taiwan’, 18 December 2025, https://www.bbc.com/news/articles/c7095g45p1po; Yifei Zhu and Jingdong Yuan, The Fourth Phase in the Taiwan Strait Military Standoff: Emerging Dynamics and the Prospect of War (EuroHub4Sino, 2025), https://doi.org/10.31175/eh4s.8a64.

[6] Chen-Yuan Tung, ed., Taiwan and the Global Semiconductor Supply Chain: China’s Pursuit of Semiconductor Self-Sufficiency, no. April/May 2025 (Singapore: Taipei Representative Office in Singapore, 2025), https://www.roc-taiwan.org/sg_en/post/13003.html.

[7] Australia New Zealand Chamber of Commerce in Taiwan, ANZCham Taiwan 2025 White Paper (Taipei: Australia New Zealand Chamber of Commerce in Taiwan (ANZCham Taiwan), 2025).

[8] Jing Huang, ‘Xi Jinping’s Taiwan Policy: Boxing Taiwan In with the One-China Framework’, in Taiwan and China, 1st edn, ed. Lowell Dittmer, Fitful Embrace (University of California Press, 2017), 239–48, JSTOR, http://www.jstor.org/stable/10.1525/j.ctt1w76wpm.16.

[9] Peipei Li et al., ‘China’s GDP at Risk: The Role of Housing Prices’, The Journal of Finance and Data Science 10 (December 2024): 100140, https://doi.org/10.1016/j.jfds.2024.100140.

[10] I. Easton, The Chinese Invasion Threat: Taiwan’s Defense and American Strategy in Asia (Project 2049 Institute, 2017), https://books.google.nl/books?id=0nqBswEACAAJ.

[11] Mark F. Cancian, Matthew Cancian, and Eric Heginbotham, The First Battle of the Next War: Wargaming a Chinese Invasion of Taiwan (Washington, DC: Center for Strategic and International Studies (CSIS), 2023), https://www.csis.org/analysis/first-battle-next-war-wargaming-chinese-invasion-taiwan.

[12] Yeong-kuang Ger, ‘Cross-Strait Relations and the Taiwan Relations Act’, American Journal of Chinese Studies 22 (2015): 235–52, JSTOR.

VICTOR BIET