#e <t>pact<d>1939 Aug 23<n>Nazi-Soviet Pact<info>After this agreement, German forces occupied western Poland while Soviet troops simultaneously occupied the eastern half. Hitler abrogated the pact and invaded the Soviet Union in May, 1941.<ref>Grolier
#p <nat>Soviet<o>president<n>Leonid Brezhnev<b>1906<el>1977 Jun 16<d>1982 Nov 10<c>Moscow
#p <nat>Soviet<o>president<n>Yuri Andropov<el>1983 Jun 16<d>1984 Feb 9<c>Moscow
#p <nat>Soviet<o>president<n>Konstantin Chernenko<b>1911 Sep 24 (N)<el>1984 Apr 11<d>1985 Mar 10<c>Moscow<info>Chernenko served as general secretary of the Soviet Union's Communist party, and effective head of state, from February, 1984, until his death. He was succeeded by Mikhail Gorbachev.
#p <nat>Soviet<o>president<n>Mikhail Gorbachev<b>1931 Mar 2<el>1985<depo>1991<c>Moscow