Collective Security Treaty Organisation
It is an intergovernmental military alliance in Eurasia that consists of select post-Soviet states. It originates from the conclusion of the Collective Security Treaty, which was signed in Tashkent (Uzbekistan) on May 15, 1992 by the heads of Armenia, Kazakhstan, Kyrgyzstan, Russia, Tajikistan and Uzbekistan. Later, it was joined by Azerbaijan, Belarus and Georgia (1993). The treaty entered into force upon completion of the national ratification procedures on April 20, 1994.
Origin: The Collective Security Treaty Organization, formed under the framework of the Commonwealth of Independent States, serves as a mutual defense alliance among Russia, Belarus, Armenia and the four Central Asian states except Turkmenistan