Which soviet leader was known as a reformer and initiated radical new reform policies, setting the stage for the dissolution of the soviet union?
boris yeltsin
leonid brezhnev
lech walesa
mikhail gorbachev

It was primarily "Mikhail Gorbachev," who was known as a reformer and initiated radical new reform policies, setting the stage for the dissolution of the Soviet Union, since it was clear that Russia was failing.