Ukrainian lawmaker and chairman of the Ukrainian opposition party Udar (Punch), WBC heavyweight boxing champion Vitali Klitschko addresses supporters during a rally at the central Independence square in Kiev, Ukraine, on Monday, Dec. 2, 2013. Thousands of protesters besieged government buildings in Ukraine's capital on Monday to demand the ouster of the prime minister and his Cabinet, as anger at the president's decision to ditch a deal for closer ties with the European Union gripped other parts of the country and threatened his rule. (AP Photo/Sergei Grits)