Barely two months into office, South Korean President Lee Jae Myung faces a pivotal foreign policy test, heading into back-to-back summits in Tokyo and Washington that reflect the wider struggle of U.

With US foreign policy in flux, Japan and South Korea are finding common ground on trade, defense, and demographic challenges.

President Donald Trump has greeted South Korea's new president, Lee Jae Myung, by claiming a “Purge or Revolution” is happening there while threatening to stop doing business with Seoul.