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U.S. President Barack Obama, right, pats Japanese Prime Minister Shinzo Abe on the shoulder as they take a closer look at the Atomic Bomb Dome after laying wreaths at the cenotaph for victims of the 1945 atomic bombing at Hiroshima Peace Memorial Park in Hiroshima, western Japan, Friday, May 27, 2016. Obama on Friday became the first sitting U.S. president to visit the site of the world's first atomic bomb attack, bringing global attention both to survivors and to his unfulfilled vision of a world without nuclear weapons. Obama touched down in Hiroshima after completing talks with world leaders at an international summit in Shima, Japan. (Kimimasa Mayama/Pool Photo via AP)