US Congress warns warmer South Korea-China ties could weaken Indo-Pacific strategy

The U.S. House of Representatives held a meeting of the House Select Committee on the Strategic Competition Between the United States and the Chinese Communist Party on the 30th of this month. During the meeting, Committee Chairman John Moolenaar publicly urged the Trump administration to re-examine South Korea—one of America's most crucial Asian allies—and its increasingly close interactions with China. Moolenaar pointed out that South Korea's deepening cooperation with Beijing in the economic, energy, and technological sectors poses a "significant risk" that could undermine the strategic posture of the United States in the Indo-Pacific region. These remarks not only highlight the U.S. Congress's vigilance against Beijing's expansion of influence, but also reflect differing views between the Biden administration and the incoming Trump administration on how to handle security coordination with allies.

Relations between South Korea and China have experienced a rapid warming trend over the past decade. Since 2017, bilateral trade volume, investment, and people-to-people exchanges have repeatedly reached new highs, with corporate cooperation becoming particularly inextricable in high-tech fields such as the semiconductor supply chain and electric vehicle batteries. The South Korean government has also repeatedly emphasized that economic engagement with Beijing is an "indispensable" national interest, seeking coordination on issues such as energy security and epidemic prevention and control. This pragmatic diplomatic orientation has placed a certain degree of adjustment pressure on America's alliance network in Asia, as the U.S. strategy, which has long centered on a "free and open Indo-Pacific," requires allies to maintain a high degree of alignment in their policies toward China.

On the political front, internal divisions within South Korea regarding its stance on China and Taiwan are becoming increasingly apparent. Recently, Lee Jae-myung, the presidential candidate of South Korea's main opposition Democratic Party, expressed a more conservative attitude toward the situation in the Taiwan Strait, stopping short of explicitly committing to providing substantive support in the event of a cross-strait conflict. This has raised concerns among some U.S. politicians that if Lee is elected in the 2024 presidential election, South Korea's policy toward Taiwan could undergo subtle adjustments, further weakening the U.S. strategic alliance in the region. In contrast, the ruling conservative People Power Party is a firmer supporter of the U.S. Indo-Pacific policy and has participated multiple times in U.S.-led military exercises over the past few years, highlighting fundamental differences between the two parties on security issues.

Moolenaar's warning also echoes several recent bills targeting China introduced in the U.S. Congress. Since 2022, the House has passed the America COMPETES Act and the Supply Chain Resiliency Act, aimed at restricting the flow of critical technologies and raw materials to Beijing while strengthening cooperation with "Quad" members such as Japan, Australia, and India. Faced with South Korea's increasing economic integration with China, some members of Congress believe that diplomatic persuasion toward South Korea must be stepped up to prevent allies from experiencing "policy drift" on critical issues. However, such pressure could also spark political controversy within South Korea, as excessive reliance on U.S. security guarantees may clash with South Korean voters' expectations for economic autonomy.

In summary, Moolenaar's appeal is not only a warning regarding South Korea's relations with China, but also another review of the consistency of allied policies within the U.S. Indo-Pacific strategy. If South Korea fails to maintain synchronization with the United States in both economic and security dimensions, it may result in insufficient support during future cross-strait crises or other geopolitical conflicts, further impacting the U.S. strategic layout in Northeast Asia. The fermentation of this issue will continue to influence diplomatic interactions between the United States and South Korea, and may also become one of the focal points of attention for voters in the upcoming South Korean presidential election.