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Russian prime minister Vladimir Putin became acting president upon President Boris Yeltsin's unexpected resignation.
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Vladimir Putin
President of Russia (1999–2008; since 2012)
Vladimir Vladimirovich Putin is a Russian politician and former intelligence officer who has served as President of Russia since 2012, having previously served from 2000 to 2008. Putin also served as Prime Minister of Russia from 1999 to 2000 and again from 2008 to 2012.Source: Wikipedia (CC BY-SA)
Acting President of Russia
Acting head of state post in Russia's constitution
The acting president of the Russian Federation is a temporary post provided by the Constitution of Russia. The acting president is a person who fulfils the duties of the president of the Russian Federation when cases of incapacity and vacancy occur. However, the person who takes…Source: Wikipedia (CC BY-SA)
Boris Yeltsin
President of Russia from 1991 to 1999
Boris Nikolayevich Yeltsin was a Soviet and Russian politician and statesman who served as President of Russia from 1991 to 1999. He was a member of the Communist Party of the Soviet Union (CPSU) from 1961 to 1990. He later stood as a political independent, during which time he…Source: Wikipedia (CC BY-SA)