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In this photo released by the Ministry of Communications and Information, Singapore, North Korean leader Kim Jong Un, center, is greeted before his departure, at Changi airport, following the summit with U.S. President Donald Trump, Tuesday, June 12, 2018 in Singapore. (Ministry of Communications and Information, Singapore via AP)

In this photo released by the Ministry of Communications and Information, Singapore, North Korean leader Kim Jong Un, center, is greeted before his departure, at Changi airport, following the summit with U.S. President Donald Trump, Tuesday, June 12, 2018 in Singapore. (Ministry of Communications and Information, Singapore via AP)