The United States is once again considering adjustments to its military presence in South Korea, citing increased defense cost-sharing and the growing need to counter China. The discussion echoes security concerns from the first Trump administration, as Washington’s strategic focus appears to be shifting from deterring North Korea’s nuclear threat to containing China’s regional influence, including the defense of Taiwan. Experts argue that South Korea must adapt its defense strategy accordingly.
The Trump administration has long advocated for expanding Strategic Flexibility, tying it to greater financial contributions from allies. Washington’s strategy prioritizes countering China’s military ambitions in the Indo-Pacific, particularly in the event of a Taiwan conflict, while expecting regional partners to take on more responsibility for threats like North Korea’s nuclear program.
During a March 1 confirmation hearing before the Senate Armed Services Committee, Lieutenant General John D. Caine, nominee for Chairman of the Joint Chiefs of Staff, stated that, if confirmed, he would reassess U.S. military presence in the Indo-Pacific to ensure it aligns with national security interests and advise the Secretary of Defense and the President accordingly. His remarks suggested potential changes to U.S. Forces Korea (USFK).
The Washington Post also reported that in March, Defense Secretary Pete Hegseth signed new strategic guidance emphasizing Taiwan’s defense and homeland security as top priorities. Meanwhile, Elbridge Colby, a nominee for a senior Pentagon policy position, has argued in his book, The Strategy of Denial, that U.S. forces should be repositioned to more effectively counter China’s rising influence in the region.
The idea of reducing or repositioning U.S. forces in South Korea is not new. Over the years, Washington has repeatedly reevaluated its global military posture, particularly following major geopolitical shifts like the end of the Cold War and the 9/11 attacks.
More recently, China has taken a more aggressive stance on Taiwan, dropping references to peaceful reunification in its annual Two Sessions meeting and conducting military drills simulating an invasion. These developments have intensified discussions in Washington about leveraging U.S. Forces Korea to deter China.
While a full withdrawal of U.S. troops from South Korea remains unlikely due to high costs and immediate security risks, many analysts believe a shift in their role is inevitable. Some suggest this strategic reassessment may proceed independently of defense cost-sharing negotiations.
The biggest concern is that a rushed overhaul of U.S. military strategy—driven by an America First agenda—could leave dangerous security gaps on the Korean Peninsula. Given these risks, experts urge the South Korean government to engage in urgent talks with Washington on the matter, especially in light of ongoing political developments.
Yoo Ji Hoon, a senior researcher at the Korea Institute for Defense Analyses (KIDA), stated that the U.S. may argue that since U.S. Forces Korea plays a crucial role in South Korea’s security, South Korea should also contribute more to Washington’s broader strategic objectives. To ensure that Strategic Flexibility benefits both nations, South Korea should gradually expand its role in regional security while maintaining a strong defense posture.