Include Russia, Belarus, Kazakhstan, Kyrgyzstan, Tajikistan and Armenia. The Collective Security Treaty Organization (CSTO) is a regional international organization established on the basis of the Collective Security Treaty (also known as Tashkent Treaty) signed in Tashkent in 1994 by the former Soviet Union countries and now the CIS countries, namely Russia, Kazakhstan, Belarus, Asia, Kyrgyzstan and Tajikistan. Founded in May 2002, signed 1992.