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
Central Committee elected by the 27th Congress of the Communist Party of the Soviet Union by Gennady Kolbin, an ethnic Russian who had never lived in the Kazakh Soviet Socialist Republic. On 23 December 1985, the Politburo appointed Boris Yeltsin, an official from Sverdlovsk, First Secretary of the Moscow City Committee ("de facto" mayor of Moscow). Gorbachev had endorsed the appointment, heeding the advice of Yegor Ligachev (the party's informal second-in-command) who personally recommended him. In contrast, Nikolai Ryzhkov told Gorbachev in private that "He [Yeltsin] will cause you only grief. I would not recommend him." Yeltsin, who had introduced himself as something of a centrist at the 27th Congress, proved himself to be a