Here's my research which found the following:
UN Security Council, General Assembly United for Peace Loophole!
Long ago, the members of the United Nations recognized that such impasses would occur in the Security Council. They set up a procedure for insuring that such stalemates would not prevent the United Nations from carrying out its mission to “maintain international peace and security.” In 1950, the United Nations by an almost unanimous vote adopted Resolution 377, the wonderfully named “Uniting for Peace.” The United States played an important role in that resolutions adoption, concerned about the possibilities of vetoes by the Soviet Union during the Cold War.
Uniting for Peace provides that if, because of the lack of unanimity of the permanent members of the Security Council (France, China, Russia, Britain, United States), the Council cannot maintain international peace where there is a “threat to the peace, breach of the peace or act of aggression,” the General Assembly “shall consider the matter immediately….” The General Assembly can meet within 24 hours to consider such a matter, and can recommend collective measures to U.N. members including the use of armed forces to “maintain or restore international peace and security.”