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.
G4 nations
The UN currently has five permanent members with veto power in the Security Council: China, France, Russia, the United Kingdom, and the United States- comprising the victors of World War II. The G4 nations are regularly elected to two-year terms on the Security Council as non-permanent members by their respective regional groups: in the 24-year period from 1987 to 2010, Brazil and Japan were elected for five terms each, Germany for four terms (one term as West Germany and three terms as unified Germany) and India for four terms. Cumulatively, the G4 has spent 64 years on the Security Council since the UN's inception, with each country serving at least a decade. By comparison, the three permanent members of the Security Council who have maintained their seats since the UN's founding (France, the UK, and the US) have each accrued years of membership. The People's Republic of China has held its permanent seat for years, since it replaced the Republic of China in 1971, and Russia has held its permanent seat for years, since it replaced the Soviet Union in 1991.