China acquiesced only reluctantly to the idea of Korean reunification after being told by Kim that Stalin had approved the action. The Chinese did not provide North Korea with direct military support (other than logistics channels) until United Nations troops, largely US forces, had nearly reached the Yalu River late in 1950. At the outset of the war in June and July, North Korean forces captured Seoul and occupied most of the South, save for a small section of territory in the southeast region of the South that was called the Pusan Perimeter. But in September, the North Koreans were driven back by the US-led counterattack that started with the UN landing in Incheon, followed by a combined South Korean-US-UN offensive from the Pusan Perimeter. By October, UN forces had retaken Seoul and invaded the North to reunify the country under the South. On 19 October, US and South Korean troops captured P’yŏngyang, forcing Kim and his government to flee north, first to Sinuiju and eventually into Kanggye.