structural:expansion, structural:reformatting, linguistic:paraphrasing, stylistic:tone
Soviet republics

By the late 1980s, people in the Caucasus and Baltic states were demanding more autonomy from Moscow, and the Kremlin was losing some of its control over certain regions and elements in the Soviet Union. Cracks in the Soviet system had begun in December 1986 in Kazakhstan when its citizens protested over an ethnic Russian who had been appointed as the secretary of the CPSU's Kazakh republican branch. These protests were put down after three days.

In November 1988, the Estonian Soviet Socialist Republic issued a declaration of sovereignty, which would eventually lead to other states making similar declarations of autonomy.

The Chernobyl disaster in April 1986 had major political and social effects that catalyzed or at least partially caused the Revolutions of 1989. One political result of the disaster was the greatly increased significance of the new Soviet policy of glasnost. It is difficult to establish the total economic cost of the disaster. According to Gorbachev, the Soviet Union spent 18 billion roubles (the equivalent of US$18 billion at that time) on containment and decontamination, virtually bankrupting itself.