Assessing the Collective Security Treaty Organization: Capabilities and Vulnerabilities
Dr Richard Weitz
Monograph by the US Army War College, Strategic Studies Institute, US Army War College Press
"The Collective Security Treaty Organization (CSTO) consists of Armenia, Belarus, Kazakhstan, Kyrgyzstan, Russia, and Tajikistan. The CSTO’s membership has been stable, with the exception that Uzbekistan, which joined the organization in 2006, withdrew in 2012. The CSTO operates on the basis of the Collective Security Treaty (CST), a mutual defense pact signed in Tashkent, Uzbekistan, on May 15, 1992. The CSTO’s initial declared purpose was to counter external aggression against members and to harmonize their foreign policy stances."