A frame grab from a video taken by U.N. observers as smoke rose over the Syrian city of Homs earlier this week. The observers said Homs had been shelled by Syrian government forces. U.N. Supervision Mission in Syria hide caption

itoggle caption U.N. Supervision Mission in Syria

A protester wearing a costume bearing the words Robocop walks among Russian riot police officers after a rally in Moscow on Saturday. Ivan Sekretarev/AP hide caption

itoggle caption Ivan Sekretarev/AP

Russian Prime Minister Vladimir Putin at a rally in Moscow on Sunday. He won election to the post he previously held: president. Alexei Nikolsky/AFP/Getty Images hide caption

itoggle caption Alexei Nikolsky/AFP/Getty Images