Stalin would order the invasion of Manchukuo on 9 August 1945, according to conditions of Tehran Conference and inaugurated in one of the largest campaigns in the Second World War. The massive Red Army steamrolled into Manchuria, brushing aside scattered Japanese resistance, and they liberated Mengjiang (Inner Mongolia), southern Sakhalin, and the northern half of the Korean peninsula as well. The rapid defeat of the Kwantung Army in Manchuria, along with the recent atomic bombing of Hiroshima and Nagasaki by the Americans, contributed significantly to the Japanese surrender on the 15th.