Russian opposition leader Sergei Udaltsov waves to the media before entering the Russian Investigative Committee's office in Moscow, Russia, Friday, Dec. 14, 2012.
Police officers detain opposition activists during an unauthorized rally in Lubyanka Square in Moscow, Russia, Saturday, Dec. 15, 2012.
A demonstrator holds a poster reading "Add Putin to "Magnitsky list" during a protest rally in St. Petersburg, Russia, Saturday, Dec. 15, 2012. About a thousand opposition supporters held a rally to mark the anniversary of mass protest. Thousands of oppo
A general view shows people gathering for an unauthorised rally to support political prisoners in central Moscow December 15, 2012. Russian riot police detained four opposition leaders on Saturday to stop them taking part in a banned rally against Preside