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.

South Korea has confirmed it fired warning shots earlier in the week at North Korean soldiers who briefly crossed the heavily-fortified border between the two countries. North Korean state media called the shots a "deliberate provocation" and Pyongyang has accused Seoul of risking "uncontrollable" tensions.