After the collapse of the Soviet Union and the end of the Cold War, new challenges and threats of a regional nature emerged. The former Soviet countries decided to sign an agreement on collective security against the backdrop of emerging threats from various terrorist groups and the seizure of power by the Taliban in Afghanistan. This article describes the causes and history of the emergence of the Collective Security Treaty and its transformation into an entire organization. This paper reveals the structure of bodies, competencies, and membership in the CSTO. Within the framework of the Collective Security Treaty and the CSTO charter, this paper explains and analyzes the actions of the CSTO during the adoption and application of forceful decisions. In addition to all the above, the article examines the prospects for development in cooperation between the CSTO and NATO in the status of regional organizations.