Flashpoints | Security | East Asia

The Trump-Xi Summit’s Nuclear Shadow Over Asia 

Beneath the summit optics lies the reality that China’s rapid nuclear transformation is increasingly straining extended deterrence and unsettling the United States’ Asian allies.

U.S. President Donald Trump participates in a welcome ceremony with President Xi Jinping of the People’s Republic of China at the Great Hall of the People in Beijing, China, May 14, 2026.

Xi Jinping’s supreme confidence in hosting U.S. President Donald Trump reflected Beijing’s conviction that time and strategic momentum are on China’s side. 

The summit’s language about “constructive strategic stability” echoed earlier Chinese diplomatic formulations under Jiang Zemin and Hu Jintao. Xi’s more salient message was that more stable relations require Washington to avoid “mishandling” Taiwan. Beneath the summit optics lies the reality that China’s rapid nuclear transformation is increasingly straining extended deterrence and unsettling the United States’ Asian allies.

China’s Nuclear Transformation

For decades, China maintained a relatively modest nuclear deterrent built around assured retaliation. That era is over. China is no longer content with a minimalist deterrent. It is building a larger, more flexible nuclear force at “breakneck speed,” designed not simply to retaliate, but to coerce. In any direct conflict, conventional combat could quickly acquire nuclear overtones, bringing escalation into view from the opening salvo.

U.S. intelligence and defense assessments show China building a full-spectrum nuclear force encompassing vast missile fields, more survivable submarines, improved bombers, and theater nuclear options that increase flexibility and risk. The issue is less modernization than the emergence of a coercive nuclear posture designed to raise doubts about U.S. resolve.

China’s expansion of the Lop Nur test site, alongside infrastructure growth at Pingtong and Zitong in Sichuan, suggests Beijing seeks the option to field a significantly larger nuclear force and, when combined with other indicators, may point to the People’s Liberation Army (PLA) moving toward a launch-on-warning posture. Its interest in early warning, counterforce capabilities, and AI-enabled decision support raises even deeper concerns. Shorter decision timelines, reduced transparency, and machine-assisted escalation dynamics could make crises less stable and miscalculation more likely. 

Beijing has created a self-reinforcing cycle of technological innovation, military firepower, and economic reward. China’s missile buildup is generating windfall profits for dozens of  firms in its opaque defense supply chain, with roughly 80 companies benefiting from procurement linked to missile production and Xi Jinping’s sweeping military modernization campaign. Combined with China’s expanding nuclear arsenal this surge in strike capacity poses a growing challenge to the United States’ defense posture in the Indo-Pacific. Beijing’s leaders may be risk-averse today, but future leaders could wrongly conclude that technological superiority escalation control when it may do precisely the opposite.

As suggested by Trump’s proposal that China enter three-power strategic arms talks, the strategic problem extends beyond China alone. Washington must simultaneously deter Russia, reassure NATO, sustain extended deterrence in Asia, and prepare for a far more capable Chinese nuclear force. U.S. allies see this challenge clearly and are beginning to adjust accordingly. The National Defense Strategy’s reference to a “critical but limited” U.S. force posture is not enough to reassure Japan and South Korea or fully restrain them from going nuclear in the long run. 

That is why recent regional diplomacy matters. The first Japan and South Korea two-plus-two vice-ministerial meeting on May 7 in Seoul reflected a shared concern over who will fill the “power vacuum” and deterrence gap in Asia, if U.S. attention is consumed elsewhere. China does not need nuclear parity with the United States to alter strategic calculations. A larger, more survivable Chinese arsenal could make U.S. leaders more cautious in a Taiwan contingency while weakening allied confidence in Washington’s commitments.

The war with Iran will likely reinforce Beijing’s determination to expand both conventional and nuclear capabilities. Chinese strategists are unlikely to conclude that restraint buys security. The opposite lesson is more probable; hardened infrastructure, deeper missile inventories, robust drone capabilities, layered air defenses, and escalation options are essential in prolonged confrontation with the United States.

But the Iran conflict is affecting more than Chinese military thinking. It is also unsettling U.S. allies.

The Iran Warning for U.S. Asian Allies

The summit’s six-week delay, brought about by the Iran conflict, allowed Xi to accrue more leverage, underscoring for the United States’ Asian allies a persistent strategic contradiction between Washington’s words and deeds. The Trump administration has declared the Indo-Pacific a priority theater, yet crises in the Middle East repeatedly consume American attention, military assets, and political bandwidth.

This credibility question is especially acute in Japan. Tokyo faces a deteriorating regional environment marked by Chinese military expansion, North Korean nuclear advances, and continued Russian activity in Northeast Asia. Washington is right to encourage Japan to assume greater defense responsibilities. But that argument becomes harder to sustain when........

© The Diplomat