 At the end of the Second World War, the Soviet Union and the United States divided up the Korean Peninsula, formerly a Japanese colonial possession, along the 38th parallel, setting up a communist government in the north and a pro-Western government in the south.North Korean leader Kim Il-sung visited Stalin in March 1949 and again in March 1950; he wanted to invade the south and although Stalin was initially reluctant to provide support, he eventually agreed by May 1950.The North Korean Army launched the Korean War by invading the south in June 1950, making swift gains and capturing Seoul.