25 years ago, on June 28, 1991, at the 46th final meeting of the session of the Council for Mutual Economic Assistance (CMEA) in Budapest, the CMEA member countries - Bulgaria, Hungary, Vietnam, Cuba, Mongolia, Poland, Romania, the USSR and Czechoslovakia - signed a protocol on abolition of the organization. This was due to the fall of the communist regimes in Eastern Europe during the "velvet revolutions".