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
Anatoly Chernyaev the Soviet Union. He became General Secretary Gorbachev's foreign-policy advisor in 1986 and continued to advise Gorbachev when the latter became President of the Soviet Union. In 2004, Chernyaev donated his diaries from the Gorbachev period to the National Security Archive at George Washington University, which has published portions of them in English translation; according to the editor, "One can confidently say that every bold foreign policy initiative advanced by Gorbachev in the years 1985-1991 bears Chernyaev's mark on it." Since then, the National Security Archive has made available Chernyaev's diaries from 1972 to 1978 with an English translation of