Ukrainian lawmaker and chairman of the opposition party Udar (Punch), WBC heavyweight boxing champion Vitali Klitschko surrounded by police trying to stop the possible collisions between police and Pro-European Union activists in Kiev, Ukraine, Monday, Dec. 9, 2013. Hundreds of police in full riot gear on Monday flooded the center of Kiev key sites of mass anti-government protests that have gripped the capital for weeks, raising fears of a crackdown.

Efrem Lukatsky / AP

Ukrainian lawmaker and chairman of the opposition party Udar (Punch), WBC heavyweight boxing champion Vitali Klitschko surrounded by police trying to stop the possible collisions between police and Pro-European Union activists in Kiev, Ukraine, Monday, Dec. 9, 2013. Hundreds of police in full riot gear on Monday flooded the center of Kiev key sites of mass anti-government protests that have gripped the capital for weeks, raising fears of a crackdown.