This study examines the concept of United Nations peacekeeping operations and their execution in Cambodia, Former Yugoslavia and Somalia from 1988 to 1995. The research is anchored primarily in United Nations documents, which were produced following the diplomatic discussions that took place in the organization on the subject of peacekeeping in general and in the cases of Cambodia, Former Yugoslavia and Somalia in particular This research demonstrates, using the records of diplomatic discourse at the United Nations, that although there was an attempt to change the concept of peacekeeping operations, it eventually failed. The best explanation for this outcome is that international politics at the United Nations – at least as it concerns peacekeeping operations – is still conducted according to the principles of each state’s realpolitik. The states formed their stance on a case by case basis, while calculating power relations in order to advance their own national interests. Therefore their position on each topic did not necessarily match the declared position of any particular political alliance. Furthermore, many multi-functional operations were still executed in accordance with the traditional concept. The main objective of these operations was international mediation between belligerent sides in order to form sovereign governments and to deploy a 'peacekeeping force' in accordance with the traditional principles of international and local consent, impartiality and the non-use of force. Traditional objectives were preferred over new objectives such as democratization, human rights, and economic development.