** FILE ** U.S. President Barack Obama, right, speaks with Russia's President Vladimir Putin during arrivals for the G-20 summit at the Konstantin Palace in St. Petersburg, Russia on Thursday, Sept. 5, 2013. (AP Photo/Alexander Zemlianichenko)

Photo by: Alexander Zemlianichenko

** FILE ** U.S. President Barack Obama, right, speaks with Russia's President Vladimir Putin during arrivals for the G-20 summit at the Konstantin Palace in St. Petersburg, Russia on Thursday, Sept. 5, 2013. (AP Photo/Alexander Zemlianichenko)