Barack Obama, Vladimir Putin

FILE – In this June 18, 2012, file photo President Barack Obama and Russiaís President Vladimir Putin, left, go to shake hands during their bilateral meeting at the G20 Summit in Los Cabos, Mexico. Obama will be joining global leaders in Northern Ireland Monday, June 17, 2013, for the Group of Eight (G-8) summit of the world’s top industrial nations, where after months of caution he is suddenly positioned more aggressively on Syria. He’s expected to prod Britain and France to follow his lead in trying to arm the Syrian rebels, and press Russia to end its support for Syrian President Bashar Assad.(AP Photo/Carolyn Kaster, File)