Police detain protest leader Alexei Navalny, seen wearing hooded jacket, after a rally in Pushkin Square in Moscow, Monday, March 5, 2012. Riot police on Monday broke up an opposition protest contesting Prime Minister Vladimir Putin's victory in Russia's presidential election, arresting dozens of participants, including prominent opposition leaders. (AP Photo/Maria Turchenkova)

Russian police block a street near the site of a protest in downtown Moscow, Russia, Monday, March 5, 2012. Riot police on Monday broke up an opposition protest contesting Prime Minister Vladimir Putin's victory in Russia's presidential election, arresting dozens of participants, including prominent opposition leaders. The police action followed a rally in downtown Moscow that drew about 20,000 protesters angry over a campaign slanted in Putin's favor and reports of widespread violations in Sunday's ballot. (AP Photo/Mikhail Metzel)

Russian police officers detain a protester after a rally in Moscow, Russia, Monday, March 5, 2012. Riot police on Monday broke up an opposition protest contesting Prime Minister Vladimir Putin's victory in Russia's presidential election, arresting dozens of participants, including prominent opposition leaders. The police action followed a rally in Moscow that drew about 20,000 protesters angry over a campaign slanted in Putin's favor and reports of widespread violations in Sunday's ballot. (AP Photo/Misha Japaridze)

Russian opposition leader Sergei Udaltsov speaks during a rally in Moscow, Russia, Monday, March 5, 2012. Riot police on Monday broke up an opposition protest contesting Prime Minister Vladimir Putin's victory in Russia's presidential election, arresting dozens of participants, including prominent opposition leaders. The police action followed a rally in downtown Moscow that drew about 20,000 protesters angry over a campaign slanted in Putin's favor and reports of widespread violations in Sunday's ballot. (AP Photo/Misha Japaridze)

Russian police officers stand ready to prevent an unsanctioned protest after a rally in Pushkin Square in Moscow, Russia, Monday, March 5, 2012. Riot police on Monday broke up an opposition protest contesting Prime Minister Vladimir Putin's victory in Russia's presidential election, arresting dozens of participants, including prominent opposition leaders. (AP Photo/Alexander Zemlianichenko)

Police officers detain RIA-Novosti photographer Andrei Stenin, bottom center, as they detain an opposition demonstrators during an unsanctioned protest near Central Election Commission office, in downtown Moscow, Russia, Monday, March 5, 2012. Riot police on Monday broke up an opposition protest contesting Prime Minister Vladimir Putin's victory in Russia's presidential election, arresting dozens of participants, including prominent opposition leaders. (AP Photo/Ivan Sekretarev)

Police officers detains an opposition demonstrator during an unsanctioned protest near Central Election Commission office, in downtown Moscow, Russia, Monday, March 5, 2012. Riot police on Monday broke up an opposition protest contesting Prime Minister Vladimir Putin's victory in Russia's presidential election, arresting dozens of participants, including prominent opposition leaders. (AP Photo/Ivan Sekretarev)

Communist party supporters hold a rally against results of presidential election in Moscow, Russia, Monday, March 5, 2012. (AP Photo/Mikhail Metzel)

Opposition demonstrators chant as they march blocking traffic at the busy Tverskaya street after a rally in Pushkin Square in Moscow, Russia, Monday, March 5, 2012. Riot police on Monday broke up an opposition protest contesting Prime Minister Vladimir Putin's victory in Russia's presidential election, arresting dozens of participants, including prominent opposition leaders. (AP Photo/Ivan Sekretarev)

A Russian woman waves out of a car window as they have wedding party while police officers, background, still block Pushkin Square after an opposition rally, in downtown Moscow, Russia, Monday, March 5, 2012. Riot police on Monday broke up an opposition protest contesting Prime Minister Vladimir Putin's victory in Russia's presidential election, arresting dozens of participants, including prominent opposition leaders. (AP Photo/Ivan Sekretarev)

A Russian woman drinks from a wine glass, while looking out of a car window as they have wedding party, while police officers, background, still block Pushkin Square after an opposition rally, in downtown Moscow, Russia, Monday, March 5, 2012. Riot police on Monday broke up an opposition protest contesting Prime Minister Vladimir Putin's victory in Russia's presidential election, arresting dozens of participants, including prominent opposition leaders. (AP Photo/Ivan Sekretarev)

Russian opposition protesters shout anti-Putin slogans during a rally in Moscow, Russia, Monday, March 5, 2012. Riot police on Monday broke up an opposition protest contesting Prime Minister Vladimir Putin's victory in Russia's presidential election, arresting dozens of participants, including prominent opposition leaders. The police action followed a rally in downtown Moscow that drew about 20,000 protesters angry over a campaign slanted in Putin's favor and reports of widespread violations in Sunday's ballot. (AP Photo/Mikhail Metzel)

Russian opposition protesters gather at a rally in Moscow, Russia, Monday, March 5, 2012. Riot police on Monday broke up an opposition protest contesting Prime Minister Vladimir Putin's victory in Russia's presidential election, arresting dozens of participants, including prominent opposition leaders. The police action followed a rally in downtown Moscow that drew about 20,000 protesters angry over a campaign slanted in Putin's favor and reports of widespread violations in Sunday's ballot. (AP Photo/Mikhail Metzel)

Opposition protesters gather a rally in Moscow, Russia, Monday, March 5, 2012. Riot police on Monday broke up an opposition protest contesting Prime Minister Vladimir Putin's victory in Russia's presidential election, arresting dozens of participants, including prominent opposition leaders. The police action followed a rally in downtown Moscow that drew about 20,000 protesters angry over a campaign slanted in Putin's favor and reports of widespread violations in Sunday's ballot. (AP Photo/Misha Japaridze)

Opposition protesters stand during the massive rally in Pushkin Square in Moscow, Russia, Monday, March 5, 2012, with a poster on the right reading "Moscow does not believe in tears!". Riot police on Monday broke up an opposition protest contesting Prime Minister Vladimir Putin's victory in Russia's presidential election, arresting dozens of participants, including prominent opposition leaders. (AP Photo/Maria Danilova)

Russian Presidential candidate and billionaire Mikhail Prokhorov speaks during an opposition rally in Moscow, Russia, Monday, March 5, 2012. Riot police on Monday broke up an opposition protest contesting Prime Minister Vladimir Putin's victory in Russia's presidential election, arresting dozens of participants, including prominent opposition leaders. The police action followed a rally in downtown Moscow that drew about 20,000 protesters angry over a campaign slanted in Putin's favor and reports of widespread violations in Sunday's ballot. (AP Photo/Misha Japaridze)

Police officers detain an opposition demonstrator after the massive rally in Pushkin Square in Moscow, Russia, Monday, March 5, 2012. Riot police on Monday broke up an opposition protest contesting Prime Minister Vladimir Putin's victory in Russia's presidential election, arresting dozens of participants, including prominent opposition leaders. (AP Photo/Alexander Zemlianichenko)

Opposition protesters gather a rally in Moscow, Russia, Monday, March 5, 2012. Riot police on Monday broke up an opposition protest contesting Prime Minister Vladimir Putin's victory in Russia's presidential election, arresting dozens of participants, including prominent opposition leaders. The police action followed a rally in Moscow that drew about 20,000 protesters angry over a campaign slanted in Putin's favor and reports of widespread violations in Sunday's ballot. (AP Photo/Misha Japaridze)

Police officers block opposition protesters after the massive rally in Pushkin Square protest in downtown Moscow, Russia, Monday, March 5, 2012. Riot police on Monday broke up an opposition protest contesting Prime Minister Vladimir Putin's victory in Russia's presidential election, arresting dozens of participants, including prominent opposition leaders. The police action followed a rally in Moscow that drew about 20,000 protesters angry over a campaign slanted in Putin's favor and reports of widespread violations in Sunday's ballot. (AP Photo/Ivan Sekretarev)

Opposition protesters gather at a rally in Moscow, Russia, Monday, March 5, 2012. Riot police on Monday broke up an opposition protest contesting Prime Minister Vladimir Putin's victory in Russia's presidential election, arresting dozens of participants, including prominent opposition leaders. The police action followed a rally in downtown Moscow that drew about 20,000 protesters angry over a campaign slanted in Putin's favor and reports of widespread violations in Sunday's ballot. (AP Photo/Misha Japaridze)