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What are the roles of United Nations in international security affairs?

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One distinct role that the United Nations plays in international security affairs is to serve as the world barometer of ensuring that the world is a safer and more secure setting.  The United Nations is able to ensure that world attention is raised to situations in which international security is threatened:

The Security Council takes the lead in determining the existence of a threat to the peace or act of aggression. It calls upon the parties to a dispute to settle it by peaceful means and recommends methods of adjustment or terms of settlement. In some cases, the Security Council can resort to imposing sanctions or even authorize the use of force to maintain or restore international peace and security.

The construction of the United Nations is meant to establish an international forum where security and peace can be a world issue.  Being able to resort to "imposing sanctions" or "authorize the use of force" are examples of the roles that the United Nations can play in establishing international security affairs.  The world's attention and focus can be brought to areas of the world that threaten the balance of international security.  This becomes the primary role of the United Nations, a forum where the world can come to agreement on situations that threaten the balance of international security affairs.

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