Protesters clash with riot police on Jan. 19, 2014 during an opposition rally in the center of Kiev. Ukrainian police used tear gas, stun grenades, and water cannon in a bid to disperse 200,000 protesters who sought to storm police cordons near the parliament building.
Riot police officers gather as they clash with protestors in Kiev on Jan. 22, 2014.
A Ukrainian protester wearing a gas mask stands amid burnt tires and garbage following clashes between pro-EU demonstrators and riot police in Kiev on Jan. 23, 2014.
Anti-government protesters clash with police in Kiev on Jan. 25, 2014.
An anti-government protester throws a Molotov cocktail during clashes with police on Hrushevskoho Street near Dynamo stadium on Jan. 25, 2014 in Kiev.
Hundreds carry torches during a rally in the western Ukrainian city of Lviv on Jan. 29, 2014.
Anti-government protesters sleep on the floor inside the Mikhailovsky Monastery in Kiev, which was converted into a makeshift hospital during Maidan protests, on Feb. 19, 2014.
Anti-government protesters let off fireworks during demonstrations in Independence Square on Feb. 19, 2014 in Kiev.
A priest holds a cross and shield during clashes between anti-government protesters and riot police in central Kiev on Feb. 20, 2014.
An anti-government protester shows empty bullet casings used by riot police against demonstrators in central Kiev on Feb. 20, 2014.
Anti-government protesters continue their clash with police in Independence Square on Feb. 20, 2014 in Kiev.
Anti-government protesters walk on a puddle of blood left by a wounded demonstrator during clashes with the police in Kiev on Feb. 20, 2014.
People walk past a campaign poster in Sevastopol on March 11, 2014 depicting Crimea in red with a swastika and covered in barbed wire (L) and Crimea with the colors of the Russian flag (R) with the word 'OR' between the two images.
Armed men believed to be Russian military patrol outside a Ukrainian military base on March 12, 2014 in Simferopol, Crimea.
Supporters of Ukraine, some with their mouths taped over, attend a rally in support of keeping Crimea part of Ukraine on March 13, 2014 in Simferopol.
Cossack men install a Russian flag and a Crimean flag on the roof of the City Hall building in Bakhchysarai, Crimea, on March 17, 2014.
An armed pro-Russian fighter poses at a checkpoint near the eastern Ukrainian city of Sloviansk on May 10, 2014.
An election official sorts through a pile of “yes” votes for independence from Ukraine, next to a short stack of ballots marked “no” at a polling station in Sloviansk on May 11, 2014, Ukraine. Pro-Russian communities in eastern Ukraine, including in Sloviansk, staged sovereignty votes in the spring in defiance of federal and international pressure.
A man in military uniform casts his vote in the Ukrainian presidential election in a polling booth on May 25, 2014 in Kiev.
Pro-Russian militants take position on the roof of the international airport of the eastern Ukrainian city of Donetsk on May 26, 2014.
A funeral ceremony is organized for a Ukrainian soldier, killed in the clashes between pro-Russian separatists and Ukrainian soldiers in Karlovka town, in Zaporizhia, Ukraine on May 27, 2014.
A woman holds a Ukrainian flag topped with the national symbol at Independence Square in Kiev as she takes part in a rally by Maidan activists calling upon the Ukrainian president to abandon the cease-fire with armed pro-Russia separatists in the east of the country, on June 29, 2014.
Debris from Malaysia Airlines Flight 17 is shown smoldering in a field on July 17, 2014 in Grabovo, Ukraine near the Russian border. Flight 17, on its way from Amsterdam to Kuala Lumpur and carrying 295 passengers and crew, was believed to have been shot down by a surface-to-air missile, according to U.S. intelligence officials.
Miners inspect a piece of debris found in a field from an Malaysia Airlines plane on July 18, 2014 in Grabovo, Ukraine.
An armed pro-Russian separatist gestures as he blocks the way to the crash site of Malaysia Airlines Flight 17 on July 20, 2014.
A Ukrainian girl cries as she stands on the road with her luggage after leaving her home near the village of Grabovo, some 50 miles east of Donetsk on Aug. 2, 2014.
A refugee from eastern Ukraine looks on as she sits in a refugee camp near the city of Donetsk on Aug. 18, 2014.
Pictures of Ukrainian protesters who were killed during demonstrations in Independence Square on display on Sept. 5, 2014 in Kiev.
A separatist fighter stands beside a Ukrainian military truck which was destroyed during recent fighting on Sept. 10, 2014 in Ilovaisk, Ukraine.