U.S. President Barack Obama and Russian President Dmitry Medvedev sign the New START Treaty.

Barack Hussein Obama II is an American politician who was the 44th president of the United States from 2009 to 2017. A member of the Democratic Party, he was the first African American president. Obama previously served as a U.S. senator representing Illinois from 2005 to 2008 and as an Illinois state senator from 1997 to 2004.

Dmitry Anatolyevich Medvedev is a Russian politician and lawyer who has served as Deputy Chairman of the Security Council of Russia since 2020. Medvedev was also President of Russia between 2008 and 2012 and Prime Minister of Russia between 2012 and 2020.

New START is a nuclear arms reduction treaty between the United States and the Russian Federation with the formal name of Measures for the Further Reduction and Limitation of Strategic Offensive Arms. It was signed on 8 April 2010 in Prague, and after ratification it entered into force on 5 February 2011.

April 8 is the 98th day of the year in the Gregorian calendar; 267 days remain until the end of the year.