In this April 27, 2018, file photo, North Korean leader Kim Jong Un, left, prepares to shake hands with South Korean President Moon Jae-in over the military demarcation line at the border village of Panmunjom in Demilitarized Zone. After a few months of rapprochement, North Korea abruptly called off scheduled high-level talks with South Korea on Wednesday, May 16, 2018, and warned the U.S. that a planned summit with President Donald Trump could be at risk. (Korea Summit Press Pool via AP, File)
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