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

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Russian Prime Minister Vladimir Putin as he voted in Moscow on Sunday (Dec. 4, 2011). Alexander Nemenov /AFP/Getty Images hide caption

itoggle caption Alexander Nemenov /AFP/Getty Images