Anti-government protesters clash with police in Kiev on February 18, 2014. #

An anti-government protester is engulfed in flames during clashes with riot police outside Ukraine's parliament in Kiev, on February 18, 2014. #

Anti-government protesters clash with police in the center of Kiev on February 18, 2014. #

Riot police aim at anti-government protesters during clashes in central Kiev, on February 18, 2014. #

Interior ministry members take cover during clashes with anti-government protesters in Kiev, on February 18, 2014. #

A photo taken on February 18, 2014 shows a riot policeman whose helmet is burning, shielding himself during clashes with anti-government protesters in central Kiev. #

Wounded people walk after clashes with riot police in central Kiev, on February 18, 2014. #

Police clash with anti-government protesters in Kiev, on February 18, 2014. #

An anti-government protester throws a stone during clashes with riot police outside Ukraine's parliament in Kiev, on February 18, 2014. #

A tent burns in the anti-government protesters camp at Independence Square in Kiev, on February 18, 2014. #

Anti-government protesters clash with riot police outside Ukraine's parliament in Kiev, Ukraine, on February 18, 2014. #

Anti-government protesters clash with riot police outside Ukraine's parliament in Kiev, on February 18, 2014. #

Protesters stand among smoke during clashes with police in Kiev, on February 18, 2014. #

An anti-government protester wears a gas mask during clashes with Interior Ministry members in Kiev, on February 18, 2014. #

Policeman evacuate a wounded colleague during clashes with anti-government protesters in Kiev, on February 18, 2014. #

Police look at dead bodies lying on the ground after clashes between anti-government protesters and security officers, in central Kiev, on February 18, 2014. #

Wounded people are seen after clashes with riot police in central Kiev, on February 18, 2014. #

Anti-government protesters clash with riot police in central Kiev, on February 18, 2014. #

Police clash with anti-government protesters in Kiev, on February 18, 2014. #

A protester aims a pistol during clashes with riot police in Kiev, on February 18, 2014. #

Anti-government protesters clash with police in in the center of Kiev, on February 18, 2014. #

An anti-government protester fires an improvised weapon during clashes with riot police outside Ukraine's parliament in Kiev, on February 18, 2014. #

Opposition demonstrators stand in front of burning barricades during clashes with police in Kiev, on February 18, 2014. #

Protesters set barricades as vehicles are burn during clashes with police in Kiev, on February 18, 2014. #

Anti-government protesters clash with riot police in Kiev's Independence Square, the epicenter of the country's current unrest, on Tuesday, February 18, 2014. #

Anti-government protesters take cover behind shields during clashes with riot police at Independence Square in Kiev, on January 18, 2014. #

Anti-government protesters clash with the police during their storming of the Independence Square in Kiev, on February 18, 2014. #

Fireworks explode near anti-government protesters during clashes with riot police in Independence Square in Kiev, on February 18, 2014. #