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 Regional Groups
The Western European and Others Group (WEOG for short) has 28 members (15% of all UN members). It has a territory dispersed on all of the continents, but mostly centred in Western Europe and North America. In addition, the United States is an observer (see below). Including the United States, WEOG has 5 seats on the Security Council: three permanent seats (France, United Kingdom, United States), and two non-permanent seats. The Group also has 13 seats on the United Nations Economic and Social Council and 7 seats on the United Nations Human Rights Council. In the rotation of the post of the President of the United Nations General Assembly, the group is eligible for having its nationals elected to this post in years ending with 0 and 5; most recently, Mogens Lykketoft of Denmark was elected to this position in 2015.