APTOPIX Japan Obama Hiroshima

U.S. President Barack Obama lays wreaths at the cenotaph 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. (AP Photo/Shuji Kajiyama)