Local riot police kneel as they apologize to Lviv residents for taking part in an operation against anti-government protesters in Kiev, during a rally in central Lviv, Ukraine, Feb. 24, 2014.

Anti-government protesters chant slogans on Independence square on Feb. 21, 2014.

Anti-government protesters gather at Independence Square on Feb. 21, 2014.

Anti-government protesters, continue to their clash with police in Independence square, despite a truce agreed between the Ukrainian president and opposition leaders, Feb. 20, 2014 in Kiev, Ukraine.

Protesters stand on barricades during clashes with police, Feb. 20, 2014 in Kiev.

Protesters clash behind burning barricades during the face off against heavily-armed police, Feb. 20, 2014 in Kiev.

Anti-government protesters prepare to advance over a burning barricade in Kiev's Independence Square, Feb. 20, 2014.

An anti-government protester shoots an improvised device during clashes with riot police in the Independence Square in Kiev, Feb. 20, 2014.

An anti-government protester holds a Ukrainian flag as he advances through burning barricades in Kiev's Independence Square, Feb. 20, 2014.

Berkut riot police throw stones at anti-government protesters, who are throwing rocks in return, on Independence Square, Feb. 19, 2014 in Kiev, Ukraine.

An anti-government demonstrator wears a gas mask behind a barricade near Kiev's Independence Square, known as Maidan, Feb. 19, 2014.

Medics tend to a gravely wounded anti-government protester in the lobby of the Hotel Ukraine, which has been converted to a medical clinic and makeshift morgue, Feb. 20, 2014 in Kiev, Ukraine.

An anti-government protester looks on as smoke from a fire rises above Independence Square in central Kiev, Feb. 19, 2014.

A protester uses a slingshot during clashes with riot police in downtown Kiev, Ukraine, Feb. 19, 2014.

Ukrainian riot police stand in front of the fire ring around of the Independence Square during the continuing protest in downtown Kiev, Ukraine, Feb. 18, 2014.

Anti-government protesters help an injured man during clashes with riot police at Independence Square in Kiev, Feb. 18, 2014.

Protesters take over the main office of the ruling Ukrainian 'Party of Regions' political party in downtown Kiev, Ukraine, Feb. 18, 2014.

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

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

Monuments to Kiev's founders burn as anti-government protesters clash with riot police in Kiev's Independence Square, the epicenter of the country's current unrest, Kiev, Ukraine, Feb. 18, 2014.

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

Riot policemen stand guard as they are hit by fire caused by molotov cocktails hurled by anti-government protesters during clashes in Kiev, Feb. 18, 2014.

Riot policemen detain wounded people after clashes in central Kiev, Feb. 18, 2014.

Police clash with anti-government protesters in Kiev, Feb. 18, 2014.

Riot police clash with anti-government protesters outside Ukraine's parliament in Kiev, Ukraine, Feb. 18, 2014.

Anti-government protesters clash with riot police outside Ukraine's parliament in Kiev, Ukraine, Feb. 18, 2014. Ukraine's festering political crisis took a deadly turn as thousands of anti-government protesters clashed with police outside Ukraine's parliament.

An anti-government protester runs in front of a flaming barricade during clashes with riot police outside Ukraine's parliament in Kiev, Ukraine, Feb. 18, 2014. Thousands of angry anti-government protesters clashed with police in a new eruption of violence following new maneuvering by Russia and the European Union to gain influence over this former Soviet republic.

Riot police take cover behind shields during a mass action of opposition at Independence Square aimed at forcing president Viktor Yanukovych to resign on Feb. 18, 2014 in Kiev, Ukraine. Mass protest actions started after the president of Ukraine Victor Yanukovych refused the association agreement with the European Union.

Opposition lawmakers block the speaker's rostrum by trying to hinder Party of Regions deputy Yury Samoilenko as he was heading to the exit on Feb. 18, 2014 as protestors were marching to the parliament, building.

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

An anti-government protester finds cover during clashes with riot police outside Ukraine's parliament in Kiev, Ukraine, Feb. 18, 2014.

A backhoe loader tractor of the Kiev communal services removes an opposition barricade in order to allow limited car traffic in accordance with an arrangement between anti-government opposition and the Ukrainian powers, in Kiev, on Feb. 16, 2014. The evacuation of city hall was one of the conditions set in an amnesty law approved by Yanukovych at the beginning of the month, promising to heed opposition demands to release detainees and drop charges against them -- but only if some parts of Kiev were evacuated.

Ukrainian protesters in front of burning automobile tires during a mass action of opposition against laws toughen requirements to carrying out mass meetings and restrict journalists activity, Jan. 22, 2014 in Kiev, Ukraine.

An opposition supporter stands next to a burning tire at a barricade in central Kiev, Ukraine, Thursday, Jan. 30, 2014.

A bare chested man waves a Ukrainian flag during clashes between the opposition and police in the centre of Kiev, Jan. 20, 2014.

A protester aims fireworks at police during clashes on Jan. 23, 2014 in Kiev, Ukraine.

Pro-European integration protesters take cover from water sprayed from a fire engine at the site of clashes with riot police in Kiev, Jan. 23, 2014.

A man reacts at a barricade near the site of clashes between anti-government protesters and riot police in Kiev, Ukraine, Jan. 25, 2014.

Tents in Independence Square in Kiev, Ukraine, are seen in this Dec. 11, 2013 photo. Ukrainian security forces stormed Kiev's Independence Square, where protesters have been gathering for over a week, but the demonstrators defiantly refused to leave and resisted the police in a tense standoff.

A thousand-strong, pro-European Union rally is reflected in the surface of a riot police officer's helmet as he guards the way to Ukrainian President Viktor Yanukovych's country residence of Mezhygirya outside Kiev, Ukraine, Dec. 29, 2013. Hundreds of riot police blocked approaches to Mezhygirya as protesters demanded Yanukovych's resignation.

Orthodox priests pray as they stand between pro-European Union activists and police lines in central Kiev, Ukraine, Jan. 24, 2014.

Pro-European integration protesters build a catapult to throw stones during clashes with police in Kiev, Jan. 20, 2014.

Ukrainian riot police take cover behind their shields in front of a burnt bus during a rally near government administration buildings in Kiev, Jan. 20, 2014.

Opposition leader and former WBC heavyweight boxing champion Vitali Klitschko, right, is attacked and sprayed with a fire extinguisher as he tries to stop clashes between police and protesters in central Kiev, Ukraine, Jan. 19, 2014.

Ukrainian riot policemen detain a bleeding protester following clashes between security forces and pro-EU demonstrators in central Kiev, Jan. 22, 2014.

Ukrainian protesters shoot homemade fireworks amongst burning automobile tires during a mass action of opposition in Kiev, Ukraine against laws toughen requirements to carrying out mass meetings and restrict journalists activity, Jan. 22, 2014.

Ukrainian protesters amongst burning automobile tires during a mass action of opposition against laws that toughen requirements to carrying out mass meetings and restrict journalists activity, on Jan. 22, 2014 in Kiev, Ukraine.

Protesters clash with police in central Kiev, Ukraine on Jan. 22, 2014.

Protesters clash with police in central Kiev, Ukraine, Jan. 22, 2014.

A protester is pictured amongst burning automobile tires during a mass action on Jan. 23, 2014 in Kiev, Ukraine.

Priests of different faiths pray during clashes with police, Jan. 23, 2014 in Kiev, Ukraine.

A protester gestures with the arms of a broken mannequin during clashes with police, Jan. 23, 2014 in Kiev, Ukraine.

A pro-European integration protester looks through a visor reflecting burning tires on Jan. 23, 2014 in Kiev, Ukraine.

A pro-European integration protester drinks near burning tires on Jan. 23, 2014 in Kiev, Ukraine.

A protester throws a Molotov cocktail onto a fire during clashes with police in central Kiev, Ukraine, early Saturday, Jan. 25, 2014.

An Orthodox Christian priest prays in front of riot police near protesters' barricades during a frosty morning in central Kiev, Ukraine, Saturday Jan. 25, 2014.