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CSTO is an intergovernmental military alliance that was signed in 1992.
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In 1992, six post-Soviet states belonging to the Commonwealth of Independent States – Russia, Armenia, Kazakhstan, Kyrgyzstan, Tajikistan, and Uzbekistan, signed the Collective Security Treaty
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This is also referred to as the “Tashkent Pact” or “Tashkent Treaty”.
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Three other post-Soviet states – Azerbaijan, Belarus, and Georgia, signed the next year and the treaty took effect in 1994.
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Five years later, six of the nine – all but Azerbaijan, Georgia, and Uzbekistan, agreed to renew the treaty for five more years, and in 2002 those six agreed to create the CSTO as a military alliance.