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 remove Gorbachev from power and prevent the signing of the new union treaty. Under the pretense that Gorbachev was ill, his vice president, Yanayev, took over as president. Gorbachev spent three days (19, 20, and 21 August) under house arrest at his dacha in the Crimea before being freed and restored to power. However, upon his return, Gorbachev found that neither Union nor Russian power structures heeded his commands, as support had swung over to Yeltsin, whose defiance had led to the coup's collapse. Furthermore, Gorbachev was forced to fire large numbers of his Politburo and, in several cases, arrest