1931- 1931-2007 1952- 1985-1991 1991- aleksandr biography economicconditions economicpolicy gorbachev history history(general)andhistoryofeurope influencemedvedev influenceputin influenceyeltsin korzhakov mikhailsergeevich militarypolicy nationalsecurity perestroĭka politicalscience(general) politicians politicsandgovernment presidents russia(federation) sovietunion statesmen vladimirvladimirovich yeltsin борисниколаевич ельцин