By Joyce Lee and David Brunnstrom SEOUL/WASHINGTON (Reuters) -North Korea is stepping up criticism of South Korea's new President Lee Jae Myung as he prepares for his first summit with U.S President Donald Trump,

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 Korean President Lee Jae Myung wants to resume dialogue with North Korea, laying out a three-step plan he hopes will convince Pyongyang to first walk back—and eventually abandon—its nuclear weapons program.