Russia–United States relations when Russia and Georgia fought a five-day war over the Russian-backed self-proclaimed republics of South Ossetia and Abkhazia. Despite U.S.–Russia relations becoming strained during the Bush administration, Russian president Dmitry Medvedev (president from May 2008 until May 2012, with Vladimir Putin as head of government) and U.S. president Barack Obama struck a warm tone at the 2009 G20 summit in London and released a joint statement that promised a "fresh start" in Russia–United States relations. The statement also called on Iran to abandon its nuclear program and to permit foreign inspectors into the country. In March 2009, U.S. Secretary of
Russia–South Ossetia relations would become part of Russia within "several years", but later retracted the comments in an interview with Interfax and stated that he may have been misunderstood, and that South Ossetia would not give up its independence. Russian Minister of Foreign Affairs Sergey Lavrov, whilst in Warsaw, denied that South Ossetia would join the Russian Federation. Lavrov's position was also mirrored in August 2009 by Dmitry Medoyev, who stated that "South Ossetia will be building an independent state". On 17 September 2008, Russia and South Ossetia signed a treaty of Friendship, Cooperation and Mutual Assistance at the Kremlin in Moscow. According