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

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.

By Tim Kelly and Joyce Lee TOKYO (Reuters) -Japanese Prime Minister Shigeru Ishiba and South Korean President Lee Jae Myung agreed on Saturday to closer security and economic ties ahead of Lee's planned summit with U.