Since the establishment of the United Nations, political operations have been at the core of its activity related to preserving international peace and security. At the same time, they are very versatile and can be used at any stage of a conflict: as preventive measures, when the situation between the conflicted parties is becoming worse; as mediation measures during an ongoing conflict, to end it; at the post-war stage, when it is necessary to develop peace conditions and a new state order. After the Iraq War, the UN established the United Nations Assistance Mission in Iraq, tasked with such issues as providing support to Iraqis in preparing and conducting democratic elections, passing a constitution, promoting national dialogue. The purpose of this article is to analyse the UN’s activity after the Iraq War, present the most important initiatives of UNAMI in terms of social and political transformations, which is to help the author answer the following questions: What role did the UN play after the Iraq War? What tasks were set before the United Nations Assistance Mission in Iraq? Were the implemented actions and initiatives effective?