United Nations System
There are 15 members of the Security Council, consisting of five veto-wielding permanent members (China, France, Russia, the United Kingdom, and the United States) and 10 elected non-permanent members with two-year terms. This basic structure is set out in Chapter V of the UN Charter. Security Council members must always be present at UN headquarters in New York so that the Security Council can meet at any time.
United Nations Security Council Resolution 129
United Nations Security Council resolution 129, adopted unanimously on August 7, 1958, called an emergency special session of the General Assembly. The resolution states that this was as a result of the lack of unanimity of its permanent members at the council's 834th and 837th meetings which prevented it from exercising its primary responsibility for the maintenance of international peace and security.