President Barack Obama and Russia's President Dmitry Medvedev order burgers during an unscheduled visit to Ray's Hell Burger in Arlington, Va., Thursday, June 24, 2010. (AP Photo/Charles Dharapak)

Photo by: Charles Dharapak

President Barack Obama and Russia's President Dmitry Medvedev order burgers during an unscheduled visit to Ray's Hell Burger in Arlington, Va., Thursday, June 24, 2010. (AP Photo/Charles Dharapak)