A Ukrainian serviceman is pictured at his position near Debaltseve, eastern Ukraine, February 8, 2015. (Photo by Gleb Garanich/Reuters)

A Ukrainian serviceman is pictured at his position near Debaltseve, eastern Ukraine, February 8, 2015. (Photo by Gleb Garanich/Reuters)

A Ukrainian serviceman is pictured at his position near Debaltseve, eastern Ukraine, February 8, 2015. (Photo by Gleb Garanich/Reuters)

A Ukrainian serviceman is pictured at his position near Debaltseve, eastern Ukraine, February 8, 2015. (Photo by Gleb Garanich/Reuters)

Ukrainian servicemen are pictured at their positions near Debaltseve, eastern Ukraine, February 8, 2015. (Photo by Gleb Garanich/Reuters)

A firefighter works to extinguish a fire at a residential block, which was damaged by a recent shelling according to locals, on the outskirts of Donetsk, eastern Ukraine February 9, 2015. (Photo by Maxim Shemetov/Reuters)

A firefighter (L) walks to the front of a residential block that has been set on fire, caused by a recent shelling according to locals, as his colleagues arrive to extinguish the fire on the outskirts of Donetsk, eastern Ukraine February 9, 2015. (Photo by Maxim Shemetov/Reuters)

People carry bags containing their belongings past a burning residential block, caused by a recent shelling according to locals, on the outskirts of Donetsk, eastern Ukraine February 9, 2015. (Photo by Maxim Shemetov/Reuters)

A woman reacts as the residential block (back) in which she lives in burns, a result of recent shelling according to locals, on the outskirts of Donetsk, eastern Ukraine February 9, 2015. (Photo by Maxim Shemetov/Reuters)

An elderly woman reacts after the residential block in which she lives in was damaged by a recent shelling, according to locals, on the outskirts of Donetsk, eastern Ukraine February 9, 2015. (Photo by Maxim Shemetov/Reuters)

Ukrainian servicemen launch Grad rockets towards pro-Russian separatist forces outside Debaltseve, eastern Ukraine February 8, 2015. Nine Ukrainian soldiers have been killed and 26 wounded in fighting with Russian-backed separatists in Ukraine's eastern regions in the past 24 hours, a Kiev military spokesman said on Monday. Ukraine's military say fighting has been particularly intense around the town of Debaltseve, a major rail and road junction northeast of the city of Donetsk. Regional police chief Vyacheslav Abroskin said seven civilians had been killed by shelling in Debaltseve and another frontline town of Avdiivka on Sunday. (Photo by Alexei Chernyshev/Reuters)

Ukrainian servicemen launch a Grad rocket towards pro-Russian separatist forces outside Debaltseve, eastern Ukraine February 8, 2015. (Photo by Alexei Chernyshev/Reuters)

Ukrainian servicemen unload Grad rockets from a truck before launching them towards pro-Russian separatist forces outside Debaltseve, eastern Ukraine February 8, 2015. (Photo by Alexei Chernyshev/Reuters)

Ukrainian servicemen load Grad rockets before launching them towards pro-Russian separatist forces outside Debaltseve, eastern Ukraine February 8, 2015. (Photo by Alexei Chernyshev/Reuters)

A man walks past a burnt vehicle, which according to locals was destroyed by a shelling, in Donetsk, eastern Ukraine February 9, 2015. (Photo by Alexander Ermochenko/Reuters)

Refugees from eastern Ukraine have a free meal in a volunteer centre near a railway station in Slaviansk February 9, 2015. (Photo by Gleb Garanich/Reuters)

A refugee from eastern Ukraine stands in a train cabin, where she is currently living in, near railway station in Slaviansk February 9, 2015. (Photo by Gleb Garanich/Reuters)

A teacher with military background gives students a basic military training lesson in Slaviansk February 9, 2015. (Photo by Gleb Garanich/Reuters)

A teacher with military background gives students a basic military training lesson in Slaviansk February 9, 2015. (Photo by Gleb Garanich/Reuters)

Students attend a basic military training lesson in Slaviansk February 9, 2015. (Photo by Gleb Garanich/Reuters)

Students attend a basic military training lesson in Slaviansk February 9, 2015. (Photo by Gleb Garanich/Reuters)

Ukrainian army pilot Nadezhda (Nadia) Savchenko looks out from a defendant's cage during a hearing at the Basmanny district court in Moscow February 10, 2015. Savchenko is accused in Russia of providing coordinates for a mortar attack in east Ukraine in which two Russian journalists were killed last summer. Her lawyers say she is not guilty. She was captured by pro-Russian rebels while fighting in a volunteer battalion in east Ukraine last June. (Photo by Maxim Zmeyev/Reuters)

Ukrainian army pilot Nadezhda (Nadia) Savchenko looks out from a defendants' cage as she attends a hearing at the Basmanny district court in Moscow February 10, 2015. (Photo by Maxim Zmeyev/Reuters)

Conscripts stand in formation before undergoing a medical examination during a general mobilisation exercise of pro-Russian separatist forces, outside a recruitment office in Donetsk, eastern Ukraine February 10, 2015. (Photo by Sergei Kirichenko/Reuters)

A woman holds the hand of the prime minister of the rebels' self-proclaimed Donetsk People's Republic (DNR), Alexander Zakharchenko (R), during a ceremony to honour the World War Two defenders of Donetsk from Nazi forces in Donetsk, in this September 8, 2014 file photo. Separatist leader Zakharchenko will not be present at a summit on east Ukraine this week but his actions will help determine the success or failure of any peace deal. While Russian President Vladimir Putin is seen in the West as holding the key to peace, Zakharchenko is regarded vital for ensuring Moscow's decisions are implemented. (Photo by Marko Djurica/Reuters)

A Ukrainian serviceman jumps off a tank damaged during fighting with pro-Russian separatist forces, as it stays on a towing truck outside Debaltseve, eastern Ukraine February 10, 2015. Separatist gains against Kiev government forces in eastern Ukraine, particularly a rebel advance on the transport hub of Debaltseve to the northeast of Donetsk, have added impetus to a Franco-German initiative to try to end the crisis. (Photo by Alexei Chernyshev/Reuters)

People look at the remains of a rocket shell on a street in the town of Kramatorsk, eastern Ukraine February 10, 2015. Three people were killed and 15 wounded in the rocket strike on the town of Kramatorsk on Tuesday, the government-controlled regional administration said in a statement. (Photo by Gleb Garanich/Reuters)

The body of a woman killed by recent shelling lies on a street in the residential sector in the town of Kramatorsk, eastern Ukraine February 10, 2015. (Photo by Gleb Garanich/Reuters)

People look at the remains of a rocket shell on a street in the town of Kramatorsk, eastern Ukraine February 10, 2015. (Photo by Gleb Garanich/Reuters)

People cover the body of a woman killed by a recent shelling of a residential sector in the town of Kramatorsk, eastern Ukraine February 10, 2015. (Photo by Gleb Garanich/Reuters)

A man looks out of a window of a residential block damaged by a recent shelling in the town of Kramatorsk, eastern Ukraine February 10, 2015. (Photo by Gleb Garanich/Reuters)

A Ukrainian serviceman guards the street next to the remains of a rocket shell in the town of Kramatorsk, eastern Ukraine February 10, 2015. (Photo by Gleb Garanich/Reuters)

A Ukrainian serviseman talks on his mobile phone as he stands in a military truck outside Debaltseve, eastern Ukraine February 10, 2015. (Photo by Alexei Chernyshev/Reuters)

Ukrainian servicemen ride in a tank past a towing truck outside Debaltseve, eastern Ukraine February 10, 2015. (Photo by Alexei Chernyshev/Reuters)

The remains of a rocket shell is seen on a street in the town of Kramatorsk, eastern Ukraine February 10, 2015. (Photo by Gleb Garanich/Reuters)

A woman removes glass from the broken window of her home in the town of Kramatorsk, eastern Ukraine February 10, 2015. (Photo by Gleb Garanich/Reuters)

A pro-Russian separatist inspects a house, where Ukrainian troops held one of their positions, in the town of Horlivka, eastern Ukraine February 10, 2015. (Photo by Maxim Shemetov/Reuters)

A tank of the separatist self-proclaimed Donetsk People's Republic, which was damaged during battles with the Ukrainian armed forces, is seen outside Vuhlehirsk, eastern Ukraine February 10, 2015. (Photo by Maxim Shemetov/Reuters)

A member of the Ukrainian armed forces rides on an armoured personnel carrier (APC) near Debaltseve, eastern Ukraine, February 10, 2015. Ukrainian President Petro Poroshenko said peace talks in Minsk on Wednesday were one of the last chances to declare an unconditional ceasefire in the conflict with Russia-backed separatists, a statement on his website said on Tuesday. (Photo by Gleb Garanich/Reuters)

Members of the Ukrainian armed forces ride on armoured personnel carriers (APC) near Debaltseve, eastern Ukraine, February 10, 2015. (Photo by Gleb Garanich/Reuters)

A military truck transports a tank near Debaltseve, eastern Ukraine, February 10, 2015. (Photo by Gleb Garanich/Reuters)

Members of the Ukrainian armed forces ride on an armoured personnel carrier (APC) near Debaltseve, eastern Ukraine, February 10, 2015. (Photo by Gleb Garanich/Reuters)

Members of the Ukrainian armed forces ride on an armoured personnel carrier (APC) near Debaltseve, eastern Ukraine, February 10, 2015. (Photo by Gleb Garanich/Reuters)

Members of the Ukrainian armed forces ride on an armoured personnel carrier (APC) near Debaltseve, eastern Ukraine, February 10, 2015. (Photo by Gleb Garanich/Reuters)

A pro-Russian separatist sits on a chair at a checkpoint in the town of Vuhlehirsk, eastern Ukraine February 10, 2015. At the front in Vuhlehirsk, a small town captured by rebels last week, volleys of artillery crashed in both directions. The rebels are pushing to encircle government forces holding out in nearby Debaltseve, a rail hub that is the main rebel target. (Photo by Maxim Shemetov/Reuters)

A pro-Russian separatist shows an anti-tank missile in the town of Vuhlehirsk, eastern Ukraine February 10, 2015. (Photo by Maxim Shemetov/Reuters)

Pro-Russian separatists inspect boxes with ammunition used by Ukrainian government troops in the town of Vuhlehirsk, eastern Ukraine February 10, 2015. (Photo by Maxim Shemetov/Reuters)

A military car, damaged during fighting between pro-Russian rebels and Ukrainian government forces, is seen on the roadside in the town of Vuhlehirsk, eastern Ukraine February 10, 2015. (Photo by Maxim Shemetov/Reuters)

A pro-Russian separatist looks on in the outskirts of Vuhlehirsk, eastern Ukraine February 10, 2015. (Photo by Maxim Shemetov/Reuters)

Pro-Russian separatists stand next to tanks on the outskirts of Horlivka, eastern Ukraine February 10, 2015. (Photo by Maxim Shemetov/Reuters)

A broken chair is pictured near a checkpoint on the outskirts of Vuhlehirsk, eastern Ukraine February 10, 2015. (Photo by Maxim Shemetov/Reuters)

A weapon of a pro-Russian separatist is pictured as a monument with a Soviet MiG-21 jet fighter is seen in the distance on the outskirts of Vuhlehirsk, eastern Ukraine February 10, 2015. (Photo by Maxim Shemetov/Reuters)

Pro-Russian separatists stand behind an armchair at a checkpoint used by Ukrainian government troops on the outskirts of Vuhlehirsk, eastern Ukraine February 10, 2015. (Photo by Maxim Shemetov/Reuters)

A Ukrainian serviceman guards the street next to the remains of a rocket shell in the town of Kramatorsk, eastern Ukraine February 10, 2015. (Photo by Gleb Garanich/Reuters)

A member of the armed forces of the separatist self-proclaimed Donetsk People's Republic stands guard near a destroyed vehicle at a bus station after shelling in Donetsk, February 11, 2015. At least one person was killed on Wednesday when a shell hit a bus station in the centre of rebel-controlled Donetsk city, east Ukraine, a Reuters witness said. (Photo by Maxim Shemetov/Reuters)

People stand around destroyed vehicles at a bus station after shelling in Donetsk, February 11, 2015. (Photo by Maxim Shemetov/Reuters)

People gather near a destroyed vehicle at a bus station after shelling in Donetsk, February 11, 2015. (Photo by Maxim Shemetov/Reuters)

Ukrainian President Petro Poroshenko (front row, C) looks at the remains of ammunition during a visit to Kramatorsk, late February 10, 2015. Rockets killed more than 10 civilians and soldiers deep in Ukrainian government-held territory in Kramatorsk on Tuesday and rebels pushed on with an assault on an army-held rail junction, setbacks that showed Kiev's position worsening on the eve of peace talks. The rockets hit the main headquarters of the Ukrainian military campaign in the east, as well as nearby residential areas. (Photo by Mikhail Palinchak/Reuters/Ukrainian Presidential Press Service)

Soldier helps an elderly woman to carry a bag of supplies outside of the humanitarian aid distribution center in the town of Debaltseve, Ukraine, Friday, February 6, 2015. (Photo by Petr David Josek/AP Photo)

A woman holds her dog while waiting on a bus to leave the town of Debaltseve, Ukraine, Friday, February 6, 2015. (Photo by Petr David Josek/AP Photo)

Residents gather as the humanitarian aid is distributed to residents in the town of Debaltseve, Ukraine, Friday, February 6, 2015. (Photo by Petr David Josek/AP Photo)

Soldier stands guard as humanitarian aid is distributed to residents in the town of Debaltseve, Ukraine, Friday, February 6, 2015. (Photo by Petr David Josek/AP Photo)

In this picture taken, Monday, February 9, 2015, Ruslan Banin, 18 years old, walks in his neighborhood in Donetsk, Ukraine. (Photo by Petr David Josek/AP Photo)

An elderly man stands next to the body of his wife, who died of an apparent heart attack after an ambulance was unable to make its way through fighting, in the town of Vuhlehirsk, eastern Ukraine, Tuesday, February 10, 2015. Fighting in eastern Ukraine intensified on Tuesday ahead of much-anticipated peace talks, with both sides claiming significant advances. (Photo by Vadim Braydov/AP Photo)

A resident rides his bicycle past a destroyed building in the town of Vuhlehirsk, Ukraine, Friday, February 6, 2015. (Photo by Petr David Josek/AP Photo)

A resident passes by an unexploded rocket in a living area in Kramatorsk, Ukraine, Tuesday, February10, 2015. (Photo by AP Photo)

A pro-Russian rebels walk past a destroyed building in the town of Vuhlehirsk, Ukraine, Friday, February 6, 2015. (Photo by Petr David Josek/AP Photo)

An Ukrainian soldier patrols territory near Debaltseve, eastern Ukraine, Sunday, February 8, 2015. The government-held town of Debaltseve, a key railway junction, has been the epicenter of recent battles between Russian-backed separatists and Ukrainian government troops. For two weeks, the town has been pounded by intense shelling that knocked out power, heat and running water in the dead of winter. (Photo by Evgeniy Maloletka/AP Photo)

Residents walk in a street in the town of Vuhlehirsk, eastern Ukraine, Tuesday, February 10, 2015. Fighting in eastern Ukraine intensified on Tuesday ahead of much-anticipated peace talks, with both sides claiming significant advances. (Photo by Vadim Braydov/AP Photo)

Ukrainian government troops sit in the back of pick-up trucks as they pass a checkpoint near the town of Mariupol, Ukraine, Tuesday, February 10, 2015. The intense fighting, which the U.N. says has killed more than 5,300 people since April, comes ahead of a crucial summit including Western leaders on Wednesday as well as peace talks later Tuesday. The volunteer Azov battalion said on social media on Tuesday that it captured several villages northeast of the strategic port of Mariupol, pushing the rebels closer to the border with Russia. (Photo by Petr David Josek/AP Photo)

A patrol made up of members of a Ukrainian volunteers battalion and policemen arrest two men on Independence Square in Kiev on February 9, 2015, who allegedly arrived from Donetsk and are suspected of participating in seperatist activities and organizing terrorist attacks in the Ukrainian capital. (Photo by Sergei Supinsky/AFP Photo)

A patrol of Ukrainian policemen and volunteer battalions members arrest men, who are suspected of terrorism on the Independence square in Kiev, Ukraine, 09 February 2015. The leaders of Germany, France, Ukraine and Russia plan to hold an emergency summit on the Ukrainian conflict in Minsk on Wednesday, with the meeting being described as a last-ditch attempt to find a peaceful solution to the crisis. (Photo by Sergey Dolzhenko/EPA)