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
International recognition of Abkhazia and South Ossetia on 28 August 2008 argued that Medvedev's decree was "a blow below the belt" for Russia's ally Serbia. "If the changes in Abkhazia and South Ossetia occurred, as Russia claims, in accordance with the example set in Kosovo, then that means that Russia has indirectly admitted that Kosovo’s departure from Serbia was lawful." In September 2009, Russian Permanent Representative to the United Nations, Vitaly Churkin, when asked by journalists why Abkhazia and South Ossetia should be internationally recognised and Kosovo not, said that "the strongest argument is the fact that at the time when Kosovo’s authorities made the UDI, nobody