Ukrainian municipal woakers carry a coffin bearing the body of Vitaliy Sirotenko, who was killed Saturday during an attack in Mariupol, Ukraine, on Tuesday January 27, 2015. A lull in the fighting in December had raised hopes for a peaceful settlement, but hostilities have escalated again in recent weeks as the rebels launched a series of new offensives. Russia has blamed the renewed fighting on the Ukrainian side, saying it has tried to settle the conflict by force. (Photo by Evgeniy Maloletka/AP Photo)

A policeman passes between burnt cars which were destroyed in a shelling on January 24 in the eastern Ukrainian city of Mariupol, January 26, 2015. The pro-Western government in Ukraine announced January 25 that it plans to bring charges before the International Criminal Court (ICC) in The Hague against the pro-Russian separatists it blames for the large number of civilian deaths in the east of Ukraine. At least 29 people were killed in a shelling of the port city of Mariupol with the Ukrainian government and the pro-Russian separatists blaming each other for the attacks. (Photo by Sergey Vaganov/EPA)

A woman wipes a tear outside of her home in the town of Svitlodarsk, Ukraine, Friday, January 30, 2015. Shelling of the town Thursday, which destroyed the local hospital, has damaged basic infrastructure, cutting off electricity, water and household gas supplies. Fighting is raging nearby between government and Russian-backed separatists for control of the railway hub in the town of Debaltseve. (Photo by Petr David Josek/AP Photo)

Organization for Security and Co-operation in Europe (OSCE) monitors investigate outside an apartment building damaged in Saturday's shelling in which scores of people were killed and injured in Mariupol, Ukraine, Tuesday, January 27, 2015. European Union leaders are threatening fresh sanctions against Russia because of what it sees as “growing support” of Moscow for separatists in eastern Ukraine during intensified fighting over the past days. (Photo by Evgeniy Maloletka/AP Photo)

A man chops wood to light a fire outside of his home in the town Svitlodarsk, Ukraine, Friday, January 30, 2015. Shelling of the town Thursday, which destroyed the local hospital, has damaged basic infrastructure, cutting off electricity, water and household gas supplies. Fighting is raging nearby between government and Russian-backed separatists for control of the railway hub in the town of Debaltseve. (Photo by Petr David Josek/AP Photo)

An injured Ukrainian soldier receives medical care at a hospital in the town of Artemivsk, Ukraine, Thursday, January 29, 2015. Fighting between government and Russian-backed separatist forces in eastern Ukraine has intensified in recent days as rebels seek to encircle the town of Debaltseve, which hosts a strategically important railway hub. (Photo by Petr David Josek/AP Photo)

A body of a civilian killed when a mortar shell landed near a bus stop, lies on the ground in Donetsk, eastern Ukraine, Friday, January 30, 2015. Artillery fire in the rebel stronghold of Donetsk killed at least 12 civilians on Friday afternoon, the city hall in the rebel stronghold said, as fighting intensifies between pro-Russia separatists and government troops. (Photo by Vadim Braydov/AP Photo)

Ukrainian servicemen fire a machine gun in the village near Mariupol, a city on the Sea of Azov, January 26, 2015. (Photo by Maksim Levin/Reuters)

People pay their final respects to the Bobylev family, Mykola Bobylev, his wife Lyubov, daughter Maryna and three-year-old grandson Vyacheslav, who were killed during a Saturday attack in Mariupol, Ukraine, on Tuesday January 27, 2015. Indiscriminate rocket fire slammed into a market, schools, homes and shops Saturday in Ukraine's southeastern city of Mariupol, killing at least 30 people, authorities said. The Ukrainian president called the blitz a terrorist attack and NATO and the U.S. demanded that Russia stop supporting the rebels. (Photo by Sergey Vaganov/AP Photo)

An injured soldier is pushed on a stretcher outside of a hospital in the town of Artemivsk, Ukraine, Friday, January 30, 2015. (Photo by Petr David Josek/AP Photo)

Vladimir Bulatkin uses a mobile phone as he examined his apartment damaged in Saturday's shelling at Vostochniy district of Mariupol, Ukraine, Monday, January 26, 2015. At least 5,100 people have been killed in eastern Ukraine since fighting began in April 2014, but violence this week was the most intense since a cease-fire deal was signed in September. Mariupol, a strategic port city on the Black Sea still controlled by Ukrainian forces, has been a symbolic bulwark against the separatist advance that if captured by the rebels would give them a land corridor to Russia-controlled Crimea. The city had been relatively quiet for months before Saturday's attack. (Photo by Evgeniy Maloletka/AP Photo)

A Ukrainian servicemen, dressed in camouflage, lies in a vehicle while his comrade locks the tailboard in a village near Mariupol, a city on the Sea of Azov, January 26, 2015. (Photo by Maksim Levin/Reuters)

A Ukrainian serviceman assists his comrade with camouflage in a village near Mariupol, a city on the Sea of Azov, January 26, 2015. (Photo by Maksim Levin/Reuters)

Medics transport a woman, who according to locals was injured by recent shelling, at a hospital in Donetsk, eastern Ukraine, January 26, 2015. (Photo by Alexander Ermochenko/Reuters)

A woman, who according to locals was injured by recent shelling, lies on a stretcher at a hospital in Donetsk, eastern Ukraine, January 26, 2015. (Photo by Alexander Ermochenko/Reuters)

A woman reacts while sitting near a man, taking cover with a blanket, at a hospital in Donetsk, eastern Ukraine, January 26, 2015. (Photo by Alexander Ermochenko/Reuters)

People hold pictures Ukrainian army pilot Nadezhda (Nadia) Savchenko as they take part in a rally demanding her liberation by Russia, at Independence Square in central Kiev, January 26, 2015. A Ukrainian female army pilot may die in detention in Russia where she is on hunger-strike, her lawyer said on Monday, calling on President Vladimir Putin to release her. Savchenko was captured by pro-Russian rebels while fighting in a volunteer battalion in east Ukraine last June. Kiev says the rebels spirited her into Russia where she was arrested and accused of killing two Russian journalists. (Photo by Gleb Garanich/Reuters)

A relative of a victim of recent shelling reacts at a cemetery in Mariupol, a city on the Sea of Azov, January 27, 2015. (Photo by Maksim Levin/Reuters)

Metropolitan Filaret, the head of one of Ukraine's Orthodox churches, sprinkles holy water during a ceremony to bless ambulances, at the Mikhailovsky Zlatoverkhy Cathedral (St. Michael's Golden-Domed Cathedral) in central Kiev January 27, 2015. Three ambulances bought with donations from the faithful were blessed during the ceremony, and will be transferred to Ukrainian servicemen fighting in east Ukraine. (Photo by Gleb Garanich/Reuters)

Members of the armed forces of Ukraine attend the funeral of a Ukrainian serviceman, who was killed while taking part in battles at the airport of Donetsk, in Mariupol, a city on the Sea of Azov, January 27, 2015. (Photo by Nikolai Ryabchenko/Reuters)

Members of the armed forces of Ukraine carry a coffin with the body of their comrade, who was killed while taking part in battles at the airport of Donetsk, during a funeral in Mariupol, a city on the Sea of Azov, January 27, 2015. (Photo by Nikolai Ryabchenko/Reuters)

Ukrainian servicemen patrol Orekhovo village in Luhansk region January 28, 2015. Russia said on Wednesday military action by Ukrainian government forces would lead to an “inevitable further escalation of the conflict” in eastern Ukraine and undermine peace efforts. (Photo by Maksim Levin/Reuters)

Ukrainian servicemen patrol Orekhovo village in Luhansk region January 28, 2015. (Photo by Maksim Levin/Reuters)

Ukrainian servicemen patrol Orekhovo village in Luhansk region January 28, 2015. (Photo by Maksim Levin/Reuters)

Ukrainian servicemen patrol Orekhovo village in Luhansk region January 28, 2015. (Photo by Maksim Levin/Reuters)

A boy poses for a picture inside a bomb shelter on the outskirts of Donetsk, January 28, 2015. Forty-four locals seeking protection from the shelling in the region have lived inside this shelter for over than a month, the residents said. (Photo by Alexander Ermochenko/Reuters)

Local residents sit inside a bomb shelter on the outskirts of Donetsk, January 28, 2015. (Photo by Alexander Ermochenko/Reuters)

Relatives react after a ceremony marking the enrolment of new conscripts in the Ukrainian army in Kiev January 29, 2015. Ukraine's parliament voted January 15 to refresh its front-line forces and resume partial conscription after a top security official warned that Russian forces backing separatist rebels had sharply increased military activity in the east. (Photo by Gleb Garanich/Reuters)

Ukrainian servicemen construct a blindage at their position near Lysychansk, in Luhansk region January 29, 2015. German Foreign Minister Frank-Walter Steinmeier said on Thursday that a fresh offensive by pro-Russian rebels in Ukraine would warrant more sanctions on Russia, while acknowledging that the new Greek government had not made discussions with EU peers easier. (Photo by Maksim Levin/Reuters)

Ukrainian servicemen fight at their position near Lysychansk, in Luhansk region January 29, 2015. (Photo by Maksim Levin/Reuters)

Local residents carry bags after receiving it as humanitarian aid at a grocery store in Donetsk, January 29, 2015. (Photo by Alexander Ermochenko/Reuters)

Local residents wait in a queue to get humanitarian aid near a grocery store in Donetsk, January 29, 2015. (Photo by Alexander Ermochenko/Reuters)

A man walks past a shop which was recently damaged by shelling, at a local market in Donetsk, eastern Ukraine, January 29, 2015. (Photo by Alexander Ermochenko/Reuters)

A girl kisses her father, a conscript, after a ceremony marking enrolment for new conscripts in the Ukrainian army in Kiev January 29, 2015. (Photo by Gleb Garanich/Reuters)

Men look at the covered bodies of victims at a site hit by shelling in Donetsk January 30, 2015. Civilians were killed on both sides in heavy fighting in eastern Ukraine on Friday, while an attempt to reopen peace talks in neighbouring Belarus was aborted before it began. Shells hit a cultural centre and a trolley bus in the eastern Ukrainian city of Donetsk on Friday, killing at least six people, Reuters journalists in the city said. The separatists said the total death toll in those two strikes was seven. (Photo by Alexander Ermochenko/Reuters)

A woman surveys damage done to a house, which according to locals was recently damaged by shelling, in the suburbs of Donetsk January 30, 2015. (Photo by Alexander Ermochenko/Reuters)

A woman reacts as she looks at the debris of her house, which according to locals was recently damaged by shelling, in the suburbs of Donetsk January 30, 2015. (Photo by Alexander Ermochenko/Reuters)

Ukraine's President Petro Poroshenko inspects an armoured vehicle in Kiev, January 30, 2015, in this handout courtesy of the Ukrainian Presidential Press Service. Poroshenko on Friday examined the first sample of the Dozor armoured personnel carrier (APC) produced by Lviv Armored Tank Plant of the State Corporate Group Ukroboronprom, according to the official presidential website. (Photo by Mykola Lazarenko/Reuters/Ukrainian Presidential Press Service)

Ukraine's President Petro Poroshenko sits in the driver's seat of an armoured vehicle in Kiev, January 30, 2015, in this handout courtesy of the Ukrainian Presidential Press Service. (Photo by Mykola Lazarenko/Reuters/Ukrainian Presidential Press Service)

Local residents gather inside a bomb shelter in Debaltseve, Donetsk region, January 30, 2015. Civilians were killed on both sides in heavy fighting in eastern Ukraine on Friday, while an attempt to reopen peace talks in neighbouring Belarus was aborted before it began. In Debaltseve, east of Donetsk, seven civilians were killed on Friday by separatist shelling of their homes, regional police chief Vyacheslav Abroskin said in a Facebook post. (Photo by Maksim Levin/Reuters)

Members of the Ukrainian armed forces gather inside a school building in Debaltseve, Donetsk region, January 30, 2015. (Photo by Maksim Levin/Reuters)

A woman gathers water from a puddle into a bucket in Donetsk, January 31, 2015. (Photo by Maxim Shemetov/Reuters)

A man sorts out fish at a market situated in the district that was shelled on Saturday, in Mariupol, Ukraine, Wednesday, January 28, 2015. (Photo by Evgeniy Maloletka/AP Photo)

A woman walks through the hallway of a city council building in the town of Debaltseve, Ukraine, Saturday, January 31, 2015. Fighting between government and Russian-backed separatist forces in eastern Ukraine has intensified in recent days as rebels seek to encircle the town of Debaltseve, which hosts a strategically important railway hub. (Photo by Petr David Josek/AP Photo)

A Ukrainian serviceman stands at a market destroyed in Saturday's shelling that killed and injured scores of people in Mariupol, Ukraine, Tuesday, January 27, 2015. (Photo by Evgeniy Maloletka/AP Photo)

A body of a civilian killed when a mortar shell landed near a bus stop, lies on the ground in Donetsk, eastern Ukraine, Friday, January 30, 2015. Artillery fire in the rebel stronghold of Donetsk killed at least 12 civilians on Friday afternoon, the city hall in the rebel stronghold said, as fighting intensifies between pro-Russia separatists and government troops. (Photo by Vadim Braydov/AP Photo)

A Ukranian armored vehicle is towed on the road towards the town of Artemivsk, Ukraine, Friday, January 30, 2015. (Photo by Petr David Josek/AP Photo)

Reservists, called up to participate in the fighting in the east of Ukraine, attend a parting ceremony at a one of the recruiting offices in Kiev on January 29, 2015. Ukrainian President Petro Poroshenko on January 29 called for urgent truce talks with pro-Russian rebels to end a bloody surge in fighting. Poroshenko said the new meeting in the Belarussian capital should lead to “an immediate ceasefire and the withdrawal of heavy weapons from the line of contact”. (Photo by Sergei Supinsky/AFP Photo)

A rebel comforts a wife of a killed civilian in shelling in Donetsk, eastern Ukraine, Friday, January 30, 2015. (Photo by Vadim Braydov/AP Photo)

Local residents receive humanitarian aid after Saturday's shelling at Vostochniy district of Mariupol, Ukraine, Monday, January 26, 2015. (Photo by Evgeniy Maloletka/AP Photo)

A woman smokes a cigarette outside of her home in the town of Svitlodarsk, Ukraine, Friday, January 30, 2015. Shelling of the town Thursday, which destroyed the local hospital, has damaged basic infrastructure, cutting off electricity, water and household gas supplies. Fighting is raging nearby between government and Russian-backed separatists for control of the railway hub in the town of Debaltseve. (Photo by Petr David Josek/AP Photo)

A body of a civilian killed in shelling is covered by a blanket in Donetsk, eastern Ukraine, Friday, January 30, 2015. (Photo by Vadim Braydov/AP Photo)

A man boils water on an open fire outside of their homes in the town of Svitlodarsk, Ukraine, Friday, January 30, 2015. (Photo by Petr David Josek/AP Photo)

Municipal workers place a coffin with a body of Alexander Demyanenko, victim of Saturday shelling into the graved during funerals in Mariupol, Ukraine, on Monday January 26, 2015. (Photo by Evgeniy Maloletka/AP Photo)

Volunteers of the “Aidar” battalion picket in front of the Ministry of Defense as they protest against a decision to change the leadership of the batallion in Kiev, Ukraine, Friday, January 30, 2015. The “Aidar” battalion, a volunteer force, is in the process of being incorporated into the Ukrainian army. (Photo by Efrem Lukatsky/AP Photo)

A woman walks past a building damaged by Saturday's shelling at the market in Mariupol, Ukraine, Wednesday, January 28, 2015. (Photo by Evgeniy Maloletka/AP Photo)

Organization for Security and Co-operation in Europe (OSCE) monitors document the site of Saturday's shelling in which scores of people were killed and injured in Mariupol, Ukraine, Tuesday, January 27, 2015. (Photo by Evgeniy Maloletka/AP Photo)

An injured soldier is loaded onto an ambulance outside of a hospital in the town of Artemivsk, Ukraine, Friday, January 30, 2015. (Photo by Petr David Josek/AP Photo)

In this Tuesday, January 20, 2015 file photo, Vladimir Bovrichev, 30, cries next to the body of his son Artiam, 4, who was killed in an artillery strike, during his funeral in Kuivisevsky district on the outskirts of Donetsk, eastern Ukraine. (Photo by Manu Brabo/AP Photo)

A body of a civilian killed when a mortar shell landed near a bus stop, lies on the ground in Donetsk, eastern Ukraine, Friday, January 30, 2015. (Photo by Vadim Braydov/AP Photo)

People wait in the hallway of a city council building before leaving the town of Debaltseve, Ukraine, Saturday, January 31, 2015. (Photo by Petr David Josek/AP Photo)

A Ukrainian woman begs Ukrainian President Petro Poroshenko to stop the bombing in Donetsk after shell hit the residential area where she lives, killing two civilians in Donetsk's Kyibishevsky district, on January 29, 2015. (Photo by Manu Brabo/AFP Photo)

A civilian and an separatist soldier look at the body of a man after shell hit a residential area, killing two civilians in Donetsk's Kyibishevsky district, on January 29, 2015. (Photo by Manu Brabo/AFP Photo)

Ukrainian serviceman escort a wounded civilian woman in the eastern Ukrainian city of Artemivsk, in the Donetsk region on January 29, 2015. Twenty-four people, including 19 civilians, were killed in the past 24 hours in clashes between government forces and pro-Russian rebels in east Ukraine, officials said. (Photo by Laetitia Peron/AFP Photo)

Relatives of Alexander Demyanenko, victim of Saturday shelling pour soil at his grave during funerals in Mariupol, Ukraine, on Monday January 26, 2015. (Photo by Evgeniy Maloletka/AP Photo)