Article Photos: Obama sets Tuesday speech; big challenges on Syria 1/15

Actors perform during a light and water show for the G-20 leaders at the Grand Palace in Peterhof, the czarist summer estate outside St. Petersburg, Russia, early Friday, Sept. 6, 2013. The threat of missiles over the Mediterranean is weighing on world leaders meeting on the shores of the Baltic this week, and eclipsing economic battles that usually dominate when the G-20 world economies meet. (AP Photo/Dmitry Lovetsky)