Permanent members of the United Nations Security Council
The permanent members of the United Nations Security Council (also known as the Permanent Five, Big Five, or P5) are the five states which the UN Charter of 1945 grants a permanent seat on the UN Security Council: China (formerly the Republic of China), France, Russia (formerly the Soviet Union), the United Kingdom, and the United States. These countries were all allies in World War II, which they won. They are also all nuclear weapons states. A total of 15 UN member states serve on the UNSC, the remainder of which are elected. Any one of the five permanent members have the power of veto, which enables them to prevent the adoption of any "substantive" draft Council resolution, regardless of its level of international support.
United Nations Security Council Resolution 1645
The resolution then set out the composition of the commission, to include seven members of the Security Council, seven members of the United Nations Economic and Social Council, the top five providers to the United Nations budget, the top five providers to United Nations peacekeeping missions, with representation from all regional groups. It also discussed country-specific meetings of the commission, where representatives of the World Bank and International Monetary Fund, among others, could participate. The Peacebuilding Commission was encouraged to co-operate with international organisations as appropriate, and provide advice to the Council in matter with which it is seized.