President Obama's Air Force One has landed at Iwakuni Marine Air Station, ahead of a historic visit to Hiroshima, the first by a sitting U.S. President to the site of the world's first atomic bombing.
Obama is expected to talk with survivors of the 1945 atomic bombings of Japan who will attend his wreath-laying ceremony Friday.
He has said he will honor all those lost in the war, not only those who perished in Hiroshima and Nagasaki.
Obama told a news conference Thursday that he will urge nuclear nonproliferation on his visit here.
North Korea's continued development of nuclear weapons represents a major concern for all nations, he said.