BSEC (ORGANIZATION OF THE BLACK SEA ECONOMIC COOPERATION)
Founded: 1992
Current members: Albania, Armenia, Azerbaijan, Bulgaria, Georgia, Greece, Moldova, Romania, Russia, Turkey, and Ukraine.
CIS (COMMONWEALTH OF INDEPENDENT STATES)
Founded: 1991
Current members: Armenia, Azerbaijan, Belarus, Georgia, Kazakhstan, Kyrgyzstan, Moldova, Russia, Tajikistan, Ukraine, and Uzbekistan. Turkmenistan is an associate member after ending its permanent membership in 2005.
CSTO (COLLECTIVE SECURITY TREATY ORGANIZATION)
Founded: 2002
Current members: Armenia, Belarus, Kazakhstan, Kyrgyzstan, Russia, Tajikistan, and Uzbekistan. Azerbaijan and Georgia withdrew in 1999.
EURASEC (EURASIAN ECONOMIC COMMUNITY)
Founded: 2000
Current members: Belarus, Kazakhstan, Kyrgyzstan, Russia, Tajikistan, and Uzbekistan.
GUAM (ORGANIZATION FOR DEMOCRACY AND ECONOMIC DEVELOPMENT)
Founded: 1997
Current members: Azerbaijan, Georgia, Moldova, and Ukraine. Uzbekistan withdrew its membership in 2005.
SCO (SHANGHAI COOPERATION ORGANIZATION)
Founded: 2001
Current members: China, Kazakhstan, Kyrgyzstan, Russia, Tajikistan, and Uzbekistan.