Negotiators at their round table in Geneva, where talks are being held about Iran's nuclear ambitions. Denis Balibouse /Reuters/Landov hide caption

itoggle caption Denis Balibouse /Reuters/Landov

Russian President Vladimir Putin and President Obama when they sat down together in June at a G8 summit in Northern Ireland. Alexi Nikolsky /EPA /LANDOV hide caption

itoggle caption Alexi Nikolsky /EPA /LANDOV