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 984
The permanent members of the Council (all of which possessed nuclear weapons) had given security assurances to non-nuclear countries that were part of the NPT, the first time this had occurred. The Security Council recognised the need to give assurances to non-nuclear weapons states, and that the permanent members of the Council will act, according to relevant provisions in the Charter of the United Nations, in the event that a country is threatened or attacked with nuclear weapons. It also recognised that the permanent member states would bring such incidents to the attention of the Security Council. Assistance would be given in any case, with investigations and appropriate measures to settle disputes and restore international peace and security. Measures would also be taken to provide technical, medical, scientific or humanitarian assistance in response to any requests from an affected country. Additionally, appropriate measures would be recommended with regard to compensation after instances of aggression and the intention of some countries to provide immediate assistance to an affected country was welcomed by the Council.