The article considers the legitimate possibilities of involving the UN in a post-conflict settlement. The history of formation of the institute of peacebuilding in the system of bodies of this organization is analyzed. Institutional and regulatory mechanisms for the application of peacekeeping operations have been identified. The peculiarities of the creation of the UN police force with the functions of monitoring the observance of the ceasefire regime in conflict zones are revealed. The definition of peacekeeping operations is described and the mechanism of their establishment by the adoption of UN Security Council resolutions is described. The article states that it was the UN that helped end the war in the Congo (1964), Iran and Iraq (1988), El Salvador (1992) and Guatemala (1996). The United Nations has made significant contributions to peace in Mozambique (1994), Sierra Leone (2005), and the declaration of independence of East Timor (2002). If the parties to the conflict do not comply, "all necessary measures" may be taken, including military action as carried out to restore Kuwait's sovereignty (1991), to deliver humanitarian aid to Somalia (1992), to restore the democratically elected Government of Haiti (1994) or to restore peace and security in East Timor in 1999.
 It is determined that in the practice of the UN such means of peacekeeping as preventive diplomacy, peace-making, peace-keeping, peace-keeping, peace-enforcement and peacebuilding in the post-conflict period have been formed. -building). The article focuses on the Peacebuilding Commission, which serves as an intermediate link between peacekeeping and post-conflict operations. The main tasks of the Commission are to establish links between all parties to coordinate actions and ensure genuine post-conflict activities. Currently, several countries are on the agenda of the Peacebuilding Commission: Burundi, Guinea, Guinea-Bissau, Liberia, Sierra Leone, and the Central African Republic.
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