Russian politician Dmitry Anatolyevich Medvedev (/mɪdˈvɛdɪf/; Russian: Дмитрий Анатольевич Медведев, IPA: [ˈdmʲitrʲɪj ɐnɐˈtolʲjɪvʲɪtɕ mʲɪdˈvʲedʲɪf]; born 14 September 1965) is a Russian politician who is serving as Deputy Chairman of the Security Council of Russia, headed by Vladimir Putin. Medvedev served as prime minister of Russia between 2012 and 2020. From 2008 to 2012, Medvedev served as president of Russia. Medvedev resigned along with the rest of the government on 15 January 2020 to allow the Russian President to make sweeping constitutional changes; he was succeeded by Mikhail Mishustin on 16 January 2020. On the same day, Vladimir Putin appointed him deputy chairman of the Security Council. Regarded as more liberal than his predecessor and successor as president, Vladimir Putin (who was also prime minister during Medvedev's presidency), Medvedev's top agenda as president was a wide-ranging modernisation programme, aiming at modernising Russia's economy and society, and lessening the country's reliance on oil and gas. During Medvedev's tenure, the New START nuclear arms reduction treaty was signed by Russia and the United States, Russia emerged victorious in the Russo-Georgian War, and recovered from the Great Recession. Medvedev initiated a substantial law enforcement reform and launched an anti-corruption campaign, despite having been accused of corruption himself.