Significant EvEntS in thE SoviEt Union and EaStErn EUropE bEtwEEn 1985-1990 timElinE By 19akalman Mar 24, 1985 Gorbachev introduces glasnost Dec 24, 1985 Gorbachev introduces perestroika Dec 8, 1987 Intermediate-Range Nuclear Forces (INF) Treaty signed Oct 21, 1989 Jozsef Antall elected prime minister of Hungary Nov 9, 1989 Berlin Wall Falls Dec 29, 1989 Vaclav Havel elected president of Czechoslovakia Mar 18, 1990 Germany reunification takes place Dec 22, 1990 Lech Walesa elected president of Poland Dec 24, 1990 1st general elections in Romania