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 on the night of 7 to 8 August 2008, the Georgian military launched an offensive on Tskhinval, the South Ossetian capital. The leader of Georgian peacekeepers in South Ossetia said the purpose was to "restore constitutional order" in the region. The majority of the inhabitants of South Ossetia hold Russian citizenship, and Russia citing Chapter VII Article 51 of the United Nations Charter sent troops into South Ossetia through the Roki Tunnel in the morning of 8 August. Russian President Dmitry Medvedev, in noting the deaths of Russian peacekeepers and South Ossetian civilians, stated: "In accordance with the Constitution and