Russian opposition leaders (front row L-R): Vladimir Ryzhkov, Gennady Gudkov, Garry Kasparov and Olga Romanova listen during a meeting with other opposition leaders in Moscow December 23, 2011. More than 40,000 Russians have signed up to protest in Moscow on Saturday against a disputed election, dismissing Kremlin promises of political change that could ease Vladimir Putin's grip on power. REUTERS/Denis Sinyakov (RUSSIA - Tags: POLITICS CIVIL UNREST)