Mikhail Gorbachev and following the Chernobyl disaster of 1986 pursued this agenda. Gorbachev's policies of "glasnost" ("openness") and "perestroika" ("restructuring") and his reorientation of Soviet strategic aims contributed to the end of the Cold War. Under this program, the role of the Communist Party in governing the state was removed from the constitution, which inadvertently led to crisis-level political instability with a surge of regional nationalist and anti-communist activism culminating in the dissolution of the Soviet Union. Gorbachev later expressed regret for his failure to save the Soviet state, though he has insisted that his policies were not failures but rather were
Mikhail Gorbachev in the Soviet Union weakened, and centralized power from Moscow was unable to combat centrifugal forces in the South. In the elections, many Party candidates were defeated. Furthermore, Boris Yeltsin was elected as mayor of Moscow and returned to political prominence to become an increasingly vocal critic of Gorbachev. Gorbachev chose a vice president; but when first Shevardnadze, then Kazakh leader Nursultan Nazarbayev, turned it down, Gorbachev chose Gennady Yanayev, the head of the All-Union Central Council of Trade Unions and a known hardliner. This decision would come back to haunt Gorbachev later. In contrast to the controversy at home