Russia's President Dmitry Medvedev, center, stands between Canada's Prime Minister Stephen Harper, right, and Argentina's President Cristina Fernandez de Kirchner, during a group photo opportunity at the G-20 summit in Pittsburgh, Friday, Sept. 25, 2009. AP Photo logo AP Photo 29 months ago

Russia's President Dmitry Medvedev, center, stands between Canada's Prime Minister Stephen Harper, right, and Argentina's President Cristina Fernandez de Kirchner, during a group photo opportunity at the G-20 summit in Pittsburgh, Friday, Sept. 25, 2009.