A woman walks past a damaged building in the town of Vuhlehirsk near Donetsk, Ukraine, Feb. 14, 2015. Baz Ratner/Reuters

A woman inspects the damage to a window caused by shelling in Donetsk, Ukraine, Feb. 14, 2015. Baz Ratner/Reuters

A part of a roof on fire falls on a firefighter as he extinguishes a building after shelling in Artemivsk, eastern Ukraine, Feb. 14, 2015. Gleb Garanich/Reuters

A local resident reacts as a firefighter extinguishes a building after shelling in Artemivsk, eastern Ukraine, Feb. 14, 2015. Gleb Garanich/Reuters

A resident removes shards of glass from her damaged window after a shell exploded near her house in central part of Eastern Ukrainian city of Donetsk, Feb. 14, 2015. VASILY MAXIMOV/AFP/Getty Images

Soldiers stand guard as humanitarian aid is distributed to residents in the town of Debaltseve, Ukraine, on Feb. 6, 2015. Petr David Josek/AP Photo

Ukrainian servicemen keep watch at no-man's land outside Debaltseve, Donetsk region on Feb. 6, 2015. The rebels have been concentrating on Debaltseve, a rail hub where a government garrison has held out despite being nearly encircled. Maxim Shemetov/Reuters

Ukrainian children look through a window of a bus near Artemivsk, eastern Ukraine, Feb. 5, 2015, as people are evacuated from Debaltseve. Evgeniy Maloletka/AP Photo

Refugees from Debaltseve get into buses in Artemivsk to escape the pro-Russain rebel shelling on Feb. 5, 2015. Volodymyr Shuvayev/AFP/Getty Images

A woman reacts outside a damaged hospital in Donetsk on Feb. 4, 2015 after at least two shells landed close by, killing several people according to a Reuters eyewitness. Maxim Shemetov/Reuters

A Ukrainian soldier holds a weapon as people wait on a bus to leave the town of Debaltseve, Ukraine on Feb. 3, 2015. Petr David Josek/AP Photo

A Ukrainian serviceman guarding Ukraine's Defence Ministry is helped up by his colleagues after failing to arrest a member of the "Aydar" battalion who entered the ministry compound, during a protest against the disbanding of the battalion in Kiev, Feb. 2, 2015. Valentyn Ogirenko/Reuters

A Ukrainian man walks through the debris produced after the Ukrainian Army hit a building in Voroshilovsky area, center of Donetsk, Ukraine, Jan. 18, 2015. Manu Brabo/AP Photo

A Ukrainian woman looks through a broken window at their flat after it was hit by Ukrainian Artillery in the Voroshilovsky area, center of Donetsk, Ukraine, Jan. 18, 2015. Manu Brabo/AP Photo

A Ukrainian man walks through the debris produced after the Ukrainian Army hit a building in Voroshilovsky area, center of Donetsk, Ukraine, Jan. 18, 2015. Manu Brabo/AP Photo

A building hit by the Ukrainian Army Artillery is seen in Voroshilovsky area, center of Donetsk, Ukraine, Jan. 18, 2015. Manu Brabo/AP Photo

A Ukrainian woman embraces her dog in a shelter during the heaviest exchange of artillery fire in the last few days, at Voroshilovsky area, center of Donetsk, Ukraine, Jan. 18, 2015. Manu Brabo/AP Photo

A new volunteer for the Ukrainian Interior Ministry's Azov battalion embraces his girlfriend before he and other volunteers depart to the frontlines in eastern Ukraine, in central Kiev, Jan. 17, 2015. Gleb Garanich/Reuters

New volunteers for the Ukrainian interior ministry's "Azov" battalion look out of the window of a bus before departing to the frontlines in eastern Ukraine, in central Kiev Jan. 17, 2015. Gleb Garanich/Reuters

New volunteers for the Ukrainian Interior Ministry's Azov battalion line up before they depart to the frontlines in eastern Ukraine, in central Kiev, Jan. 17, 2015. Gleb Garanich/Reuters

Protesters, Police Clash in Eastern Ukraine A Ukrainian football supporter wearing a T-shirt showing the Russian President with a bullet hole in his forehead shouts slogans as he takes part in the "March of Unity" in the western Ukrainian city of Lviv on July 22, 2014. Yuriy Dyachyshyn/AFP/Getty Images

Protesters, Police Clash in Eastern Ukraine A fight breaks out in the Ukraine parliament between members of the Svoboda Party and the Regions Party during discussion of a presidential decree to call up additional military reserves to its border with Russia on July 22, 2014 in Kiev. Anadolu Agency/Getty mages

Young boys look into the broken windows of a building in the eastern Ukrainian city of Donetsk on July 22, 2014. Ukrainian forces clashed with separatist pro-Russian rebels on the outskirts of Donetsk on July 22, a day after five people were reported killed by shelling in the area. Alexander Khudoteply/AFP/Getty Images

Self-proclaimed Prime Minister of the pro-Russian separatist "Donetsk People's Republic" Alexander Borodai is seen during a press conference in the eastern Ukrainian city of Donetsk, on July 19, 2014. Borodai ruled out a temporary truce with government forces but pledged to allow investigators to access the site of downed Malaysia Airlines jet MH17. Bulent Kilic/AFP/Getty Images

People look out the window of one of five buses departing eastern Ukraine on July 14, 2014, for the Rostov region in Russia where the passengers will apply for refugee status. Dmitry Lovetsky/AP Photo

Igor Chernetsov, whose wife was killed in a building demolished by an airstrike, gestures near the collapsed structure in Snizhne, eastern Ukraine, July 15, 2014. At least nine civilians were killed in the attack, rescue workers said, adding to the steadily growing number of civilians killed over four months in a dogged pro-Russian insurgency. Dmitry Lovetsky/AP Photo

A Ukrainian serviceman patrols in the village of Semenovka, near the eastern Ukrainian city of Slavyansk in the Donetsk region on July 14, 2014. Genya Savilov/AFP/Getty Images

Relatives of Ukrainian servicemen, who are at war with pro-Russian militants in the east of the country, shout slogans as they hold a placard reading "Mothers of Rokytne district plead for help!" during a rally in front of the presidential office in Kiev on July 16, 2014. Sergei Supinsky/AFP/Getty Images

A Ukrainian serviceman sits on a multiple rocket launcher "Grad" set on the position near the eastern city of Seversk on July 12, 2014, a day after the town was freed from pro-Russian militants. Genya Savilov/AFP/Getty Images

Ukrainian servicemen ride on an armoured personnel carrier (APC) as they patrol in the small eastern city of Seversk on July 12, 2014, a day after the town was freed from pro-Russian militants. Genya Savilov/AFP/Getty Images

A Ukrainian government soldier looks through binoculars while sitting on an armored vehicle as Ukrainian troops take up a position some 20km south of Donetsk, eastern Ukraine, on July 10, 2014. Dominique Faget/AFP/Getty Images

A pro-Russian militant stands near an explosion crater on July 8, 2014 after an air strike in Donetsk, Eastern Ukraine. Dominique Faget/AFP/Getty Images

Ukrainian Army soldiers line up in front of Pro Russia civilians who where blocking the road in the Andreevka, 10 km south to Slaviansk, Ukraine, May 2, 2014. Russia has massed tens of thousands of troops in areas near Ukraine's border. Kiev officials claim Russia is preparing to invade and that it is fomenting the unrest in the east, where insurgents have seized government buildings in about a dozen cities in towns. Moscow denies the allegations, but Foreign Minister Sergey Lavrov has warned Russia would respond to attacks on Russian citizens or interests in the east. Manu Brabo/AP Photo

Firefighters evacuate an injured man outside the burnt trade union building where more than 30 people died trying to escape during clashes in Odessa, Ukraine, May 2, 2014. Sergei Poliakov/AP Photo

Ukrainian Army soldier smokes in front of an armoured vehicle at a burned out Pro Russia checkpoint while Pro Russia civilians block the road to Slavyansk, in the village of Andreevka, 10 km south of Slaviansk , Ukraine, May 2, 2014. Manu Brabo/AP Photo

Pro-Ukrainian supporters wave national flags outside the burnt trade union building where more than 30 people died trying to escape during clashes in Odessa, Ukraine, May 2, 2014. Sergei Poliakov/AP Photo

Ukrainian Army soldier rests on the grass near the road while Pro Russia civilians block the road to Slavyansk in the village of Andreevka, 10 km south to Slavyansk, Ukraine, May 2, 2014. Manu Brabo/AP Photo

Ukrainian government supporters with a Ukrainian flag, prepare for a clash with pro-Russians in the Black Sea port of Odessa, Ukraine, May 2, 2014. Sergei Poliakov/AP Photo

Ukrainian police guard the burnt trade union building where more than 30 people died trying to escape during clashes in Odessa, Ukraine, May 2, 2014. Sergei Poliakov/AP Photo

Trashed items are smoldering among debris at a square following clashes in Odessa, Ukraine, May 2, 2014. Sergei Poliakov/AP Photo

Pro-Russian protesters burn Ukrainian symbols in front of the regional administration building after clash with police in Donetsk, Ukraine, May 1, 2014. Evgeniy Maloletka/AP Photo

A pro Russia activist is seen in a tear gas cloud while throwing rocks at the prosecutor building, after a pro Russia demonstration during International Worker's Day in Donestsk, Ukraine, May 1, 2014. Manu Brabo/AP Photo

A Pro Russia activist lies on the ground wounded during the assault of the prosecutor building, after a pro Russia demonstration during International Worker's Day in Donestsk, Ukraine, May 1, 2014. Manu Brabo/AP Photo

Pro-Russian activists clash with police in front of the regional administration building in Donetsk, Ukraine, Thursday, May 1, 2014. Evgeniy Maloletka/AP Photo

Pro-Russian gunmen guard the central square of Slovyansk, eastern Ukraine, May 2, 2014. Alexander Zemlianichenko/AP Photo

Pro Russian activists stand with their shields in defensive position after storming the prosecutor building, after a pro Russia demonstration during International Worker's Day in Donestsk, Ukraine, May 1, 2014. Manu Brabo/AP Photo

A Ukrainian soldier smokes under armored personnel carrier at a road leading into Slovyansk, eastern Ukraine, May 2, 2014. Darko Vojinovic/AP Photo

Pro-Russian activists stand guard at the regional administration building in Donetsk, Ukraine, May 2, 2014. Evgeniy Maloletka/AP Photo

Anti-government demonstrators storm the regional police station in Krasnoarmiisk, Donetsk region, eastern Ukraine, May 1, 2014. AP Photo

Ukrainian soldiers stand guard at a road leading into Slovyansk, eastern Ukraine, May 2, 2014. Darko Vojinovic/AP Photo

Pro-Russian activists walk by a barricade at the regional administration building in Donetsk, Ukraine, May 2, 2014. Evgeniy Maloletka/AP Photo

Residents carry a poster reading "We are for peace" as they walk to Ukrainian soldiers standing guard on a road outside Slovyansk, eastern Ukraine, May 2, 2014. Max Vetrov/AP Photo

Pro-Russian protesters clash with police as they try to occupy a regional administration building in Donetsk, Ukraine, April 6, 2014. Protesters are calling for former President Yanukovych to return to Ukraine and to hold a referendum on the status of the Donetsk and Lugansk regions, similar to the recently held referendum in Crimea. Roman Pilipey/EPA

Pro-Russian activists wave Russian flags during a rally in the eastern Ukrainian city of Donetsk on March 22, 2014. Alexander Khudoteply/AFP/Getty Images

Russian President Vladimir Putin, center, signs the treaty of annexation of Crimea and formation of new federal districts in a meeting with Prime Minister of Crimea Sergey Aksyonov, left, mayor of Sevastopol Aleksei Chaliy, right, on March 18, 2014 in Moscow, Russia. A. Nikolskiy/ Kremlin Press Office/Anadolu Agency/Getty Images

Pro-Russian self-defense activists occupy the Ukrainian navy headquarters as Russian soldiers patrol outside in the Crimean city of Sevastopol on March 19, 2014. Viktor Drachev/AFP/Getty Images

A Russian flag waves over during the workers installing a new sign on the local parliament building that reading "State council of the Crimean Republic", in Simferopol, Crimea, on March 19, 2014. Bulent Doruk/Anadolu Agency/Getty Images

Fireworks light up the sky in Russia's capital Moscow during the celebrations of the annexed of Crimea after the Association Agreement signed on the sidelines of an EU summit in Brussels on Friday as Russia formally annexed the breakaway region of Crimea on March 21, 2014. Sefa Karacan/Anadolu Agency/Getty Images

A pro-Russia demonstrator gestures as others storm the prosecutor-general's office during a rally in Donetsk, Ukraine, Sunday, March 16, 2014. Andrey Basevich/AP Photo

Pro-Russia demonstrators face Ukrainian police officers surrounding the Donetsk regional administration building during a rally in Donetsk, Ukraine, Sunday, March 16, 2014. Andrey Basevich/AP Photo

A man exits a voting booth prior to cast his vote in a local school on March 16, 2014, in Simferopol. FILIPPO MONTEFORTE/AFP/Getty Images

Armed men, believed to be Russian servicemen, stand guard outside a Ukrainian military base in Perevalnoye on March 16, 2014. DIMITAR DILKOFF/AFP/Getty Images

A man and child exit a voting booth after casting a vote in the Crimean referendum in Simferopol, Ukraine, Sunday, March 16, 2014. Vadim Ghirda/AP Photo

A pro-Russian cossacks volunteer holds a whip during an oath-taking ceremony in Sevastopol, on March 15, 2014, the day before the referendum in Crimea. VIKTOR DRACHEV/AFP/Getty Images

Pro-Russia protesters storm the door of the regional governance Security Service of Ukraine building during a rally in Donetsk, Ukraine, Saturday, March 15, 2014. Sergei Grits/AP Photo

A Crimean tatar woman prays for Crimea's aftermath prior to the upcoming referendum scheduled for March 16 to join Russia in Simferopol, Ukraine on March 14, 2014. Bulent Doruk/Getty Images

Demonstrators wearing red and two WWII veterans, right, march in support of Kremlin-backed plans for the Ukrainian province of Crimea to break away and merge with Russia, in Moscow, Saturday, March 15, 2014. Alexander Zemlianichenko/AP Photo

Pro-Russian supporters rally in Lenin Square on March 15, 2014 in Simferopol, Ukraine. Dan Kitwood/Getty Images

People attend a pro-Ukrainian rally in Bakhchisaray, March 14, 2014. Russia shipped more troops and armour into Crimea on Friday and repeated its threat to invade other parts of Ukraine, showing no sign of listening to Western pleas to back off from the worst confrontation since the Cold War. The placards read: "I Want to Live" (R) and "No to War". David Mdzinarishvili/Reuters

Military vehicles, believed to be Russian, drive on the road near Bakhchisaray, March 14, 2014. Russia shipped more troops and armour into Crimea and repeated its threat to invade other parts of Ukraine, showing no sign of listening to Western pleas to back off from the worst confrontation since the Cold War. David Mdzinarishvili/Reuters

Troops under Russian command scream orders to turn back before firing weapons into the air at an approaching group of over 100 unarmed Ukrainian troops at the Belbek airbase, which the Russian troops are occcupying, in Crimea, March 4, 2014, in Lubimovka, Ukraine. Sean Gallup/Getty Images

Ukrainian air force pilots march in their air base in Belbek, near Sevastopol, on March 4, 2014. Russian forces surrounding the air base in Belbek fired warning shots at Ukrainian servicemen. Viktor Drachev/AFP/Getty Images

A Ukrainian Navy officer looks at Russian ships blocking access to the Sevastopol bay, March 4, 2014. The Russian Black Sea Fleet commander Aleksandr Vitko has issued an ultimatum to the Ukrainian military personnel in Crimea. Viktor Drachev/AFP/Getty Images

Ukrainian air force pilots guard an air base in Belbek, near Sevastopol, March 4, 2014. Viktor Drachev/AFP/Getty Images