Why did Boris Yeltsin denounce Mikhail Gorbachev?

Boris Yeltsin denounced Mikhail Gorbachev primarily due to Gorbachev's policies of glasnost (openness) and perestroika (restructuring), which Yeltsin believed were insufficient and too slow in addressing the economic and political crises facing the Soviet Union. Yeltsin's criticism also stemmed from a desire for greater political freedom and reform, positioning himself as a champion of Russian nationalism and democratic change. Their relationship deteriorated further during the failed coup in August 1991, where Yeltsin emerged as a key figure opposing Gorbachev's leadership. Ultimately, Yeltsin's denunciation was part of a broader struggle for power and the direction of the Soviet Union's future.