Presidential adviser Kim Yong-beom said investments announced during the summit should include already announced projects such as Samsung Electronics' new chip factory in Texas and Hyundai Motor's car factory in Georgia, as well as Hanwha's plan to expand its U.S. shipyard.

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.