Research in the field of regional conflict resolution rarely touches on the issue of justice. This paper aims to identify what understanding of international justice underlies Russia’s actions as a mediator/peacekeeper in the process of regional conflict resolution in the 1990s-2010s. The study also contributes to the understanding of Russia’s foreign policy by clarifying Moscow’s views on the essence and parameters of a just global order. The paper provides a study of the dominant Russian views on the essence of justice in international relations. It offers an insight into Russia’s peace-making and conflict resolution activities in the context of the three concepts of global justice and taking into account the factor of national interests. The study concludes that the dominant understanding of international justice in Russia is that which corresponds to Allen Buchanan’s concept of subjective justice. In Moscow’s view, international justice is a set of rules developed in the process of consensus driven negotiations between the great powers. According to this logic, a just settlement of the regional conflict is possible only on the basis of the consensus of the parties to the conflict and in accordance with the interests of the global and regional powers concerned. The fair interaction of the great powers in the settlement of the regional conflict and the impact that the conflict resolution could have on the development of the international order were of crucial importance for Moscow within the period under consideration. Moscow’s activity in the conflict resolution in the post-Soviet space generally corresponded to the model of justice as mutual recognition, but with absolute priority of Russian national interests. The strategy for resolving regional conflicts in the post-Soviet space could only be understood in the broad context of relations with Western countries and has changed in line with the development of these relations.