This period ended when Mikhail Gorbachev, who succeeded Chernenko, introduced his policies of "glasnost", "perestroika", "uskoreniye", and "demokratizatsiya", leading to the Revolutions of 1989 and the dissolution of the Soviet Union in 1991.
This period ended, "uskoreniye", and "demokratizatsiya", leading to the Revolutions of 1989 in 1991. This period ended, "uskoreniye", and "demokratizatsiya", leading to the dissolution of the Soviet Union in 1991. Mikhail Gorbachev introduced his policies of "glasnost", "perestroika". Mikhail Gorbachev succeeded Chernenko.