G20 Summit (24 images)

(L-R) Sarah Brown,British Prime Minister Gordon Brown,American President Barack Obama and Michelle Obama pose for the media on the steps of No.10 Downing St on the eve of the G20 summit in London on Wednesday April 1, 2009. (UPI Photo/Hugo Philpott)

U.S. President Barack Obama speaks at a press conference at the end of the G20 Summit at the ExCel Centre in London on April 4, 2009. (UPI Photo/Rune Hellestad)

British Prime Minister Gordon Brown speaks at a press conference at the end of the G20 Summit at the ExCel Centre in London on April 4, 2009. (UPI Photo/Rune Hellestad)

Russian President Dmitry Medvedev (L) and German Chancellor Angela Merkel arrive for a news conference after their meeting in Berlin on March 31, 2009 ahead of the G20 summit in London. (UPI Photo/Alex Volgin)