In this July 4, 2017, file photo, South Korean President Moon Jae-in speaks as he presides over a meeting of the National Security Council at the presidential Blue House in Seoul, South Korea. Moon believes the best way to solve the North Korean nuclear crisis is engagement of the sort that two past liberal leaders used to win historic summits with Pyongyang. (Kim Ju-hyung/Yonhap via AP, File)
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