Anti-government protesters wave flags and shout slogans Tuesday in Kiev, Ukraine. Vasily Fedosenko /Reuters/Landov hide caption

itoggle caption Vasily Fedosenko /Reuters/Landov

Vitali Klitschko, head of the opposition UDAR party, waves a flag during a rally in downtown Kiev, Ukraine, on Dec. 1. The WBC heavyweight boxing champion has emerged as one of Ukraine's most popular political figures, as massive anti-government protests grip the country. Sergei Grits/AP hide caption

itoggle caption Sergei Grits/AP