Political map of East Asia and the Western Pacific 24 November 1950 (UN Offensive in Korea): After halting the North Korean advance (Korean War), the UN forces (United Nations Command (Korea)) counterattacked. In just a few weeks, they cleared South Korea then launched their own invasion of the North (UN Offensive, 1950). However, their success now threatened China, which secretly began moving in its own forces (People's Volunteer Army) to protect North Korea.