In the Second World War Russia (or the U.S.S.R. as it was then), which had been fighting Germany since the Nazi invasion of 1941, only got round to declaring war on Japan on 8 August 1945. That was three days after the first atomic bomb landed on Hiroshima and one day before the second landed on Nagasaki. The Japanese empire was now squeezed between the vast armed forces of Russia and America, and it disintegrated. Japan had forcibly annexed Korea in 1910, but the Japanese were now driven out. The U.S.S.R occupied the northern half of Korea with its capital at Pyongyang, and the U.S.A. occupied the southern half with its capital at Seoul.