The article identifies the contribution of the Collective Security Treaty Organization in Central Asia (CSTO) to the process of ensuring security in Central Asia. Conceptual approaches to the CSTO in the foreign policy of the Russian Federation and its allies in the region are analyzed. The documents of the CSTO are examined, as well as its practical activities to ensure regional security, prevent military threats, combat extremism, and terrorism and drug trafficking. The peacekeeping activities of the CSTO are examined. At the same time, an answer is given to the question why the CSTO did not deploy a peacekeeping mission at the request of Kyrgyzstan during the unrest in 2010, but responded to a similar request from Kazakhstan during the January events of 2022.