The Collective Security Treaty Organization (CSTO) was formed on the basis of the Collective Security Treaty, which was signed in 1992 after the dissolution of the Soviet Union. Article 4 of the treaty, which is central to the CSTO’s operation, states that an attack on one member is considered an attack on all members and obligates the organization to provide assistance if the aggrieved member requests help. This provision effectively established the CSTO as a mutual defense pact.
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