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Demonstrators brave bitter cold temperatures as they march during a massive protest against Prime Minister Vladimir Putin's rule in Moscow, Saturday, Feb. 4, 2012. Tens of thousands of Russians flooded downtown Moscow on Saturday to demand an end to Putin's rule, casting a strong challenge to his bid to reclaim the presidency in March. Saturday's crowd appeared to be even bigger than two similar rallies held in December, despite temperatures plunging to minus 20 C (minus 4 F). (AP Photo/Ivan Sekretarev)

Anti-Putin protests

Thousands of Russians joined hands to form a human chain around Moscow city center on Feb. 26 in protest against Vladimir Putin's likely return as president in an election next week.