That is, if the U.S. does something to reciprocate.

North and South Korea reopened a maritime communication channel on Sunday, with vessels from the two countries making radio contact for the first time in a decade.

President Moon Jae-in intends to more actively perform "the role of a mediator" in various channels between South Korea, the U.S. and North Korea.

South Korea said U.S. troops stationed in the South are unrelated to any future peace treaty with North Korea and that American forces should stay even if such an agreement is signed.

During a rally in Michigan on Saturday night, Trump was greeted by crowds chanting "Nobel, Nobel, Nobel!"

North Korean leader Kim Jong Un has vowed to shut down the country’s nuclear test site in May and open the process to experts and journalists from South Korea and the United States, Seoul’s presidential office said Sunday.