Significant Events in the Soviet Union & Eastern Europe By 19kafoster Dec 24, 1985 Gorbachev introduces glasnost Dec 24, 1985 Gorbachev introduces perestroika Dec 24, 1987 Intermediate-Range Nuclear Forces (INF) Treaty signed Dec 24, 1989 Berlin Wall Falls Dec 24, 1989 Jozsef Antall elected prime minister of Hungary Dec 24, 1989 Vaclav Havel elected president of Czechoslovakia Dec 24, 1990 Lech Walesa elected president of Poland Dec 24, 1990 Germany reunification takes place Dec 24, 1990 1st general elections in Romania