The U.S. president greeted survivors of the first-ever atomic bombing and made a landmark speech.
Obama is the first U.S. president to visit the city since its bombing in 1945.
The visit on Friday has stirred debate, with critics accusing both sides of having selective memories.
President reiterates he won't apologize for decision in 'the midst of war' to drop bomb.
Will become first sitting U.S. president since World War II to visit the Japanese city hit by an atomic bomb.
A nuclear war would be so devastating, any attempts to survive it would be futile.
Tens of thousands died instantly when the U.S. dropped an atomic bomb on Hiroshima on Aug. 6, 1945.
Sergey Naryshkin said that the bombings were not founded on humanitarian considerations or military necessity.
As soon as the bombs were dropped, the men who invented them began searching their consciences.