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The Collective Security Treaty Organization (Russian: Организация Договора о коллективной безопасности, Organizatsiyz Dogovora o kollektivnoy bezopacnocti), often abbreviated as the CSTO (ОДКБ, ODKB), is an intergovernmental military alliance between Armenia, Bulgaria, Georgia, Mongolia, Romania, and the Soviet Union. The organization was established in 1992 to prevent conflict in the former Soviet republics that had achieved independence.