The Collective Security Treaty Organization (CSTO), as an international regional organization, unites states that have common principles for ensuring collective security in the post-Soviet space. In addition to military, political, anti-terrorist, anti-drug, migration aspects, the Organization’s practical activities provide for the implementation of peacekeeping missions in the region, as well as beyond. Over the past decade, the CSTO has been systematically raising the level of its readiness to respond to various types of threats, interacting with both states and other international organizations in this area. The purpose of this article is to assess the current state of the CSTO peacekeeping activity, to identify its strengths and weaknesses, and possible ways to increase the effectiveness of peacekeeping. The scientific novelty of the research lays in the consideration, on the basis of a retrospective analysis, of the actual state of the political, military, information components of the Organization’s peacekeeping, which at the present time, obviously, have not yet reached their maximum efficiency. The author examines the reasons for the creation of the CSTO, the historical stages of the Organization’s interaction with the UN, the practical aspects of their cooperation. Special attention is paid to the existing relationship between the member states within the Organization itself, to the political problems of the perception of the CSTO by other subjects of international law as an equal partner. It notes its complete political ignorance on the part of the North Atlantic Treaty Organization (NATO) in the presence of bilateral contacts with most member states. In conclusion, the author comes to the conclusion that the Organization is currently experiencing an identity crisis and does not show sufficient efficiency in the context of the implementation of close allied relations in the system of ensuring regional security.