S Korea must navigate 'Trump risk' at key summits in Japan, US

South Korea's President Lee Jae Myung faces a pivotal foreign policy test barely two months after taking office, with back-to-back summits in Tokyo and Washington that reflect the wider struggle of US allies to navigate Donald Trump's unilateral push to redefine postwar orders on trade, security and alliances.

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The meetings come after Seoul and Tokyo reached trade deals with Washington that spared them from the Trump administration's highest tariffs, but only after pledging hundreds of billions of dollars in new US investments.

Trump's transactional approach with long-standing allies extends beyond trade to security and has fueled fears in South Korea that he will demand higher payments to support the US troop presence in the country, even as he possibly seeks to scale back America's military footprint there to focus on China.

The looming concerns about a US retreat in leadership and security commitments come as South Korea and Japan confront growing cooperation between their nuclear-armed adversaries, North Korea and Russia, partners in the war in Ukraine and in efforts to break isolation and evade sanctions.