"The UN Charter gives the Security Council primary responsibility for maintaining international peace and security. The Council may convene at any time, whenever peace is threatened. Under the Charter, all Member States are obligated to carry out the Council's decisions.

There are 15 Council members. Five of these — China, France, the Russian Federation, the United Kingdom and the United States — are permanent members. The other 10 are elected by the General Assembly for two-year terms. Member States are discussing making changes in Council membership and working to reflect today's political and economic realities.

Decisions of the Council require nine yes votes. Except in votes on procedural questions, a decision cannot be taken if there is a no vote, or veto, by a permanent member.

When the Council considers a threat to international peace, it first explores ways to settle the dispute peacefully. It may suggest principles for a settlement or undertake mediation. In the event of fighting, the Council tries to secure a ceasefire. It may send a peacekeeping mission to help the parties maintain the truce and to keep opposing forces apart.

The Council can take measures to enforce its decisions. It can impose economic sanctions or order an arms embargo. On rare occasions, the Council has authorized Member States to use "all necessary means," including collective military action, to see that its decisions are carried out.

The Council also makes recommendations to the General Assembly on the appointment of a new Secretary-General and on the admission of new Members to the UN."