U.S. President Donald Trump, left, and Chinese President Xi Jinping visit the Temple of Heaven in Beijing, May 14. Xi warned Trump that the Taiwan issue could push the two countries into "conflict" if mishandled, a stark opening message as a high-stakes summit between the superpowers began in the Chinese capital that day. AFP

U.S. President Donald Trump’s suggestion that U.S. arms sales to Taiwan could become a bargaining chip in negotiations with China has sent a tremor through the strategic architecture of East Asia. Speaking after his summit with Chinese President Xi Jinping, Trump said they had discussed Taiwan “in great detail,” particularly the issue of weapons sales, and that he would “make a decision soon.” In doing so, he signaled that one of the most sensitive pillars of U.S. policy in Asia may no longer be governed by principle, but by transaction.

For decades, the United States maintained a carefully calibrated approach toward Taiwan. After normalizing relations with Beijing in 1979, Washington terminated its formal defense treaty with Taipei but enacted the Taiwan Relations Act, committing itself to provide Taiwan with defensive capabilities. In 1982, the Reagan administration further reassured Taipei through the “Six Assurances,” including a pledge not to consult Beijing in advance regarding arms sales to Taiwan. Together with the longstanding policy of “strategic ambiguity,” these commitments formed the backbone of regional stability in the Taiwan Strait.

Trump’s remarks cut directly against that tradition. By openly acknowledging that Taiwan arms sales were discussed with Xi Jinping, he effectively undermined the very principle that Washington had upheld for more than four decades. More troubling still was the implication that previously approved weapons packages could be reconsidered or reduced if doing so advanced broader U.S. interests with China.

The potential consequences extend far beyond Taiwan. At stake is the credibility of America’s alliance system across Asia. U.S. allies have long accepted strategic risk and invested heavily in defense on the assumption that Washington’s commitments, while not unconditional, were fundamentally reliable. Taiwan itself responded to growing Chinese military pressure by sharply increasing defense spending and expanding purchases of American weaponry, partly at Washington’s urging. Yet Trump’s comments suggest that even core security assurances may become negotiable if they interfere with larger geopolitical or economic bargains.

This is the essence of what many allies increasingly fear as the “Trump risk”: the possibility that longstanding commitments can be subordinated to short-term calculations of national advantage. The concern is not theoretical. Trump has repeatedly approached alliances through a transactional lens, measuring them less by solidarity than by immediate returns to the United States. Whether on NATO burden-sharing, troop deployments in South Korea or trade disputes with allies, he has shown a willingness to blur the line between partnership and leverage.

In East Asia, where deterrence depends heavily on perceptions of American resolve, such ambiguity carries profound consequences. If Beijing concludes that Washington’s commitment to Taiwan is softening, China may grow more assertive in testing the limits of regional order. Conversely, countries such as South Korea and Japan may begin to question whether the United States would ultimately stand firm in a crisis that carries significant costs for itself.

That erosion of confidence could trigger destabilizing adjustments throughout the region. Japan may accelerate efforts to expand its military role beyond postwar constraints. South Korea, already uneasy about the reliability of extended deterrence against North Korea’s advancing nuclear capabilities, may feel greater pressure to strengthen independent defense capacities. Smaller regional states could hedge more openly between Washington and Beijing, weakening the cohesion of the U.S.-led alliance network that has underpinned Asian stability for generations.

For South Korea in particular, the lesson is sobering. The Trump administration has already emphasized “strategic flexibility” for U.S. forces stationed in Korea while expecting Seoul to assume greater responsibility for its own defense. On North Korea, Washington’s priority has often appeared to center on threats to the American homeland — especially intercontinental ballistic missiles — rather than the broader security concerns of its allies. If Taiwan can become part of broader U.S.-China negotiations, Seoul cannot assume that South Korean interests will always remain insulated from great power bargaining either.

None of this means that the U.S. alliance system is collapsing, nor that American support for Taiwan will disappear overnight. Institutions, congressional sentiment and strategic realities continue to constrain any abrupt reversal. But Trump’s remarks nonetheless reveal a deeper shift in the logic of U.S. foreign policy: from alliances rooted in long-term commitment to relationships increasingly judged through the prism of transactional gain.

Source: Korea Times News