when did the soviet union declared war on japan and invade manchuria
Soviet–Japanese War The Soviet–Japanese War (Russian: Советско-японская война; Japanese: ソ連対日参戦, "Soviet Union entry into war against Japan") was a military conflict within the Second World War beginning soon after midnight on August 9, 1945, with the Soviet invasion of the Japanese puppet state of Manchukuo. The Soviets and Mongolians terminated Japanese control of Manchukuo, Mengjiang (Inner Mongolia), northern Korea, Karafuto, and the Chishima Islands. The defeat of Japan's Kwantung Army helped in the Japanese surrender and the termination of World War II.[7][8] The Soviet entry into the war was a significant factor in the Japanese government's decision to surrender unconditionally, as it made apparent the Soviet Union would no longer be willing to act as a third party in negotiating an end to hostilities on conditional terms.[1][9][10][11][12][13][14][15]
First Sino-Japanese War The First Sino-Japanese War (25 July 1894 – 17 April 1895) was fought between the Qing Empire and the Empire of Japan, primarily over influence of Korea. After more than six months of unbroken successes by Japanese land and naval forces and the loss of the port of Weihaiwei, the Qing government sued for peace in February 1895.