The Collective Security Treaty Organization (CSTO) is a military alliance formed in 1992, primarily involving countries from the former Soviet Union. Its main goal is to ensure mutual defense and security among its member states, which include Armenia, Belarus, Kazakhstan, Kyrgyzstan, Russia, and Tajikistan. The CSTO aims to counter external threats and promote stability in the region. The organization operates on the principle that an attack on one member is considered an attack on all. This collective defense approach is similar to that of NATO, but the CSTO focuses more on regional security issues and cooperation among its members to address challenges like terrorism and drug trafficking.