For Taiwan, the concern is immediate and existential: whether Washington will sustain both political support and arms transfers in the face of Beijing's sovereignty claim. For South Korea, the dilemma is less direct but consequential: whether the peninsula could be drawn into a broader U.S. strategy in a Taiwan contingency, pulling Seoul beyond its traditional role of deterring North Korea.
Taiwan loomed over Trump's three-day Beijing summit despite the ceremony. Xi warned that mishandling the issue — Beijing's "top concern" — could "spiral into conflict." Trump told reporters the U.S. was not seeking to promote Taiwan's independence and confirmed he had discussed arms sales with Xi, but declined to say whether a pending weapons package would proceed, saying only he would decide "very quickly."
Washington has no formal diplomatic relations or mutual defense treaty with Taipei. Its security commitment rests on the 1979 Taiwan Relations Act, which requires making available defense articles sufficient for Taiwan's self-defense and designates any non-peaceful attempt to determine Taiwan's future as a matter of "grave concern."
South Korea's position is structurally different. A formal U.S. treaty ally hosting roughly 28,500 American troops, Seoul's alliance has long centered on deterring North Korea. But U.S. Forces Korea is increasingly discussed within Washington's broader Indo-Pacific posture. The 2026 National Defense Strategy envisions South Korea taking primary responsibility for deterring the North with more limited U.S. support.
"The Korean Peninsula is no longer simply a space of inter-Korean confrontation," said Jeong. "Senior U.S. military officials refer to the peninsula as a key axis within the first island chain. South Korea could face growing pressure to support U.S. operations in a Taiwan contingency."
Seoul is also preparing for the transfer of wartime operational control, possible as early as the first quarter of 2029, contingent on meeting three conditions including demonstrated capability to respond to North Korean threats.
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