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
South Ossetia territorial integrity. The EU's diplomatic response to the news was delayed by disagreements between Eastern European states, the UK wanting a harsher response and Germany, France and other states' desire not to isolate Russia. Former US envoy Richard Holbrooke said the conflict could encourage separatist movements in other former Soviet states along Russia's western border. Several days later, Nicaragua became the second country to recognize South Ossetia. Venezuela recognized South Ossetia on September 10, 2009, becoming the third UN member state to do so. The European Union, Council of Europe, North Atlantic Treaty Organization (NATO) and most UN member countries