He came to power after being promoted by former Soviet leader Mikhail Gorbachev, a man he then outmanoeuvred. He won international acclaim as a defender of democracy when in August 1991 he mounted a tank in Moscow. In what became one of the defining moments of his career, Mr Yeltsin rallied the people against an attempt to overthrow Mr Gorbachev's era of glasnost and perestroika. etc.
http://news.bbc.co.uk/2/hi/europe/6584481.stm