Police officers guard during an unauthorized rally in Lubyanka Square in Moscow, Saturday, Dec. 15, 2012. Thousands of opposition supporters have gathered in central Moscow for an unauthorized rally and several prominent opposition figures have been detained. (AP Photo/Mikhail Metzel)

Associated Press
Police officers guard during an unauthorized rally in Lubyanka Square in Moscow, Saturday, Dec. 15, 2012. Thousands of opposition supporters have gathered in central Moscow for an unauthorized rally and several prominent opposition figures have been detained. (AP Photo/Mikhail Metzel)
Police officers guard during an unauthorized rally in Lubyanka Square in Moscow, Saturday, Dec. 15, 2012. Thousands of opposition supporters have gathered in central Moscow for an unauthorized rally and several prominent opposition figures have been detained. (AP Photo/Mikhail Metzel)
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