Supporters of Prime Minister and President-elect Vladimir Putin wave flags during a supporters rally in central Moscow May 6, 2012. Russian riot police beat protesters with batons and hauled away dozens on Sunday after skirmishes broke out at a demonstration in Moscow against Vladimir Putin on the eve of his return to the presidency. REUTERS/Sergei Karpukhin (RUSSIA - Tags: CIVIL UNREST CRIME LAW POLITICS TPX IMAGES OF THE DAY)