After South Korea’s long adherence to a policy of “strategic ambiguity” in balancing relations between China and the United States, President Yoon Suk-yeol has made it clear that he believes following Washington’s lead on the challenges facing the region is in Seoul’s best interest. During the Association of Southeast Asian Nations (ASEAN) summit in Cambodia last weekend, Yoon introduced South Korea’s “Indo-Pacific” strategy, which is committed to “principles of freedom, peace and prosperity built on a rules-based order” for the region. Yoon’s strategy echoes that of the US and Japan, which have long warned of the growing threat posed by...