Medvedev says U.S. can move on missile shield

U.S. President Barack Obama (L) stands with Russia's President Dmitry Medvedev as they assemble for the second official group photograph at the G20 summit at the ExCel centre, in east London April 2, 2009. World leaders are set to declare an end to unfettered capitalism at a G20 summit on Thursday after France and Germany demanded they act fast on promises to prevent a repeat of the worst economic crisis since the 1930s.. REUTERS/Dylan Martinez