The Security Council was largely paralysed in its early decades by the Cold War between the US and USSR and their allies, and the Council generally was only able to intervene in unrelated conflicts. (A notable exception was the 1950 Security Council resolution authorizing a US-led coalition to repel the North Korean invasion of South Korea, passed in the absence of the USSR.) In 1956, the first UN peacekeeping force was established to end the Suez Crisis; however, the UN was unable to intervene against the USSR's simultaneous invasion of Hungary following that country's revolution. Cold War divisions also paralysed the Security Council's Military Staff Committee, which had been formed by Articles 45–47 of the UN Charter to oversee UN forces and create UN military bases. The committee continued to exist on paper but largely abandoned its work in the mid-1950s.