The purpose of this paper was to examine if UN (United Nations) peacekeeping operations an be used as a tool to promote great powers own interests and enable power maximization for states in the international system. In other words, if great powers really cooperate with each other to promote peace or if they only seek to maximize their own power position. Based on the assumption that the state’s own interests benefit from its commitment to the UN and that it ultimately can increase the state’spower position, it becomes thus important to identify a state’sown interests to contribute to an explanation of how states act within international institutions. The case of China and its actions in African countries through the UN peacekeeping operations MONUSCO and UNMIS are evaluated, to verify if China applies to 4 of the 5 assumptions raised in John Mearsheimer’s theory of offensive realism. This, to illustrate how states attempt to use economic, military and multilateral means to increase their power position in the international system. The conclusion of the analysis is that 3 (possibly 4) of Mearsheimer’s assumptions are encountered by China’s actions. After demonstrating that China applies to some of theas sumptions of offensive realism, this study suggests further research concerning the connection between great powers pursuit of power and its commitment to UN peacekeeping operations.