What did the Soviet Union do after the atomic bomb was dropped on Hiroshima?
On August 6, 1945, an atomic bomb was dropped on the people of Hiroshima. Early in the morning of August 9th Manchuria was invaded by the Soviet Union. The Soviets had notified Japan's Ambassador to Moscow on the night of the eighth that the Soviet Union would be at war with Japan as of August 9th (Butow, pg.153-154, 164(n)).n August 8 - before the Soviets announced their declaration of war and before the Nagasaki a-bomb was detonated-Foreign Minister Togo met with the Emperor to tell him what he knew of the Hiroshima bombing. They agreed that the time had come to end the war at once (Pacific War Research Society, DML, pg.