1931- 1931-2007 1931-2022 asia biography borisnikolayevich eastern economicconditions economichistory economicpolicy foreignrelations formersovietrepublics gorbachev headsofstate history mikhailsergeevich newyorktimesreviewed perestroika perestrojka perestroïka perestroĭka politicsandgovernment politiqueetgouvernement russia russia(federation) southeastasia sovietunion theformersovietunion yeltsin