British Prime Minister David Cameron, left, shakes hands with Russian President Vladimir Putin during a press conference at 10 Downing Street in London, Sunday, June 16, 2013. Cameron had talks with Russian President Putin on the Syrian crisis amid fears that differences between Moscow and the West are pushing the two sides toward a new Cold War. (AP Photo/Anthony Devlin)

Photo by: Anthony Devlin

British Prime Minister David Cameron, left, shakes hands with Russian President Vladimir Putin during a press conference at 10 Downing Street in London, Sunday, June 16, 2013. Cameron had talks with Russian President Putin on the Syrian crisis amid fears that differences between Moscow and the West are pushing the two sides toward a new Cold War. (AP Photo/Anthony Devlin)