1931- 1952- 1989- biographies biography changementsocial ex-presidents general gorbachev gorbatchev history internationalrelations kommunisticheskai͡apartii͡asovetskogosoi͡uza kommunisticheskai︠a︡partii︠a︡sovetskogosoi︠u︡za mikhailsergeevich mikhailsergueevitch perestroĭka perestroïka perestroĭka philosophy pol011000 politicalandsocialviews politicalculture politicalscience politicsandgovernment politik politiqueetgouvernement presidents présidents putin russia(federation) russie socialchange sovietunion urss vladimirvladimirovič worldpolitics