In an attempt to halt the rapid changes to the system, a group of Soviet hard-liners represented by Vice-President Gennady Yanayev launched a coup overthrowing Gorbachev in August 1991. Russian President Boris Yeltsin rallied the people and much of the army against the coup and the effort collapsed. Although restored to power, Gorbachev's authority had been irreparably undermined. In September, the Baltic states were granted independence. On December 1, Ukraine withdrew from the USSR. On December 26, 1991 the USSR officially dissolved, breaking up into fifteen separate nations.