Early warning is an essential component of prevention, and the United Nations carefully monitors developments around the world to detect threats to international peace and security, thereby enabling the Security Council and the Secretary-General to carry out preventive action. Envoys and special representatives of the Secretary-General are engaged in mediation and preventive diplomacy throughout the world. In some trouble spots, the mere presence of a skilled envoy can prevent the escalation of tension. These envoys often cooperate with regional organizations.