Soviet control of its non-Russian member republics weakened rapidly as movements for democratization and self-government gained strength during 1990 and 1991. The Soviet coup d'état attempt in August 1991 began the breakup of the USSR, which formally ended on December 26, 1991. The Republics of the Soviet Union become sovereign states—Armenia, Azerbaijan, Byelorussia (later Belarus), Estonia, Georgia, Kazakhstan, Kyrgyzstan, Latvia, Lithuania, Moldova, Russia, Tajikistan, Turkmenistan, Ukraine and Uzbekistan. Historian Robert Daniels says, "A special dimension that the anti-Communist revolutions shared with some of their predecessors was decolonization." Moscow's policy had long been to settle ethnic Russians in the non-Russian republics. After independence, minority rights for Russian-speakers has been an issue; see Russians in the Baltic states.