U.S. President Barack Obama (R) speaks with Russian President Dmitry Medvedev at Winfield House, the U.S. ambassador's residence in London April 1, 2009. Russia and the United States will pursue an arms deal cutting nuclear warheads below levels agreed in 2002, presidents Dmitry Medvedev and Barack Obama said on Wednesday in their first step towards mending relations, ahead of the G20 summit.    REUTERS/Jason Reed     (BRITAIN POLITICS BUSINESS)
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