Armed pro-Russian separatists talk to local residents on a street in the settlement of Makiivka, on the outskirts of Donetsk, August 19, 2014. Artillery fire could be heard on Tuesday in Makiivka, on the eastern outskirts of the rebel-controlled city of Donetsk, Reuters reporters at the scene said. (Photo by Maxim Shemetov/Reuters)

Friends and relatives say goodbye to volunteers before they were sent to the eastern part of Ukraine to join the ranks of special battalion “Azov” fighting against pro-Russian separatists, in Kiev, Ukraine, Sunday, August 17, 2014. Ukraine's national security council said government forces captured a district police station in Luhansk after bitter clashes, but the government also reported Sunday that separatists have shot down a Ukrainian fighter plane in Luhansk region after army troops entered deep inside a rebel-controlled city in the east. (Photo by Efrem Lukatsky/AP Photo)

An armed pro-Russian separatist looks as flames erupt from a gas pipeline after a shelling in Donetsk, August 15, 2014. (Photo by Sergei Karpukhin/Reuters)

Refugees from the Luhansk region wait to board a train terminating in Kharkiv, at a railway station near the town of Svatovo August 12, 2014. (Photo by Stanislav Belousov/Reuters)

A man stands near the body of a victim killed by a recent shelling in Donetsk, August 14, 2014. Artillery shells hit close to the centre of Ukraine's separatist-held city of Donetsk for the first time on Thursday, killing at least one person, as a large Russian aid convoy rumbled towards the border. (Photo by Sergei Karpukhin/Reuters)

Russian military vehicles drive along the road outside Kamensk-Shakhtinsky, Rostov Region, August 16, 2014. If Russia and Ukraine slide into outright war, the United States and allies will face tough choices on how to support a friendly state they have no intention of making a full NATO member. (Photo by Maxim Shemetov/Reuters)

Ukrainian soldiers detain a man (C) suspected of spying for pro-Russian militants at a checkpoint near Debaltseve, Donetsk region, on August 16, 2014. Ukraine's crisis entered dangerous new territory with Kiev claiming its forces destroyed a Russian military convoy, while the US warned Moscow over its “provocative” efforts at destabilisation. (Photo by Anatolii Stepanov/AFP Photo)

Ukrainian servicemen detain a pro-Russian activist at a checkpoint near the eastern Ukrainian town of Debaltseve, August 16, 2014. Ukrainian forces and pro-Russian separatists fought skirmishes near the Russian border on Saturday but there was no sign of the conflict widening after Kiev said it partially destroyed an armoured column that had crossed the border from Russia. (Photo by Valentyn Ogirenko/Reuters)

Ukrainian soldiers of the “Donbass” battalion stand guard during an anti-terrorist operation against militants, in Maryinka town, near of Donetsk, Ukraine, 12 August 2014. Ukrainian government forces have narrowed the ring around Luhansk and the other rebel stronghold in Donetsk. Fighting in the neighbouring Donetsk region continued unabated. Authorities in Donetsk said that seven civilians were injured when artillery fire hit the city, which has a peacetime population of 1 million. (Photo by Roman Pilipey/EPA)

Members of International Committee of the Red Cross check products in a storehouse after Ukrainian convoy delivered humanitarian aid for eastern Ukrainian regions, in town Starobelsk, Ukraine, 15 August 2014. Ukraine sent its own aid convoy to the region. Iryna Herashchenko, an aide to President Petro Poroshenko, said that a number of lorries have arrived in the Luhansk region and that Red Cross workers had begun unloading them. The trucks carry vegetables, cereals, sugar, flour, sunflower oil, canned food, honey, tea, soap, washing powder and other products and goods as Ukrainian officials told. (Photo by Roman Pilipey/EPA)

Russian armored vehicles with servicemen atop on a road outside the town of Kamensk-Shakhtinsky in Rostov region, about 30 km from the Russian-Ukrainian border, Russia, 15 August 2014. NATO Secretary General Anders Fogh Rasmussen confirmed media reports that Russian military vehicles have crossed the border into Ukraine, his office says. A Russian convoy carrying humanitarian aid for residents in rebel eastern Ukrainian regions came to hold in Kamensk-Shakhtinsky on 14 August waiting for agreement between Moscow and Kiev concerning the delivery of the humanitarian aid sent by Russia. (Photo by Yuri Kochetkov/EPA)

A Ukrainian soldier inspects a car at a checkpoint near the eastern Ukrainian city of Debalcevo, in Ukraine, 16 August 2014. Ukrainian forces partly destroyed a Russian military column inside Ukraine, President Petro Poroshenko said 15 August, but Russia insisted that no military vehicles had entered the neighbouring country. NATO and journalists from several newspapers confirmed Ukraine's reports of the Russian incursion. (Photo by Roman Pilipey/EPA)

Ukrainian soldiers of a special teamand their dog monitor the area after they found explosive device near the eastern Ukrainian city of Debalcevo, in Ukraine, 16 August 2014. (Photo by Roman Pilipey/EPA)

Alexey Danilenko (23) with his neighbor show damaged car after fighting between militants and Ukrainian forces in eastern Ukrainian village Seleznevka, near of Slaviansk, Ukraine, 17 August 2014. Alexey Danilenko and his family were in Seleznevka during fierce fighting between militants and Ukrainian forces. Alexey said, that more than 80 percent buildings in village were damage. (Photo by Roman Pilipey/EPA)

Ukrainian border guards check people suspected of crossing the border illegally in the small city of Novoazovsk, Donetsk region on the border with the Russian Federation on August 15, 2014. Ukraine army “destroyed” military vehicles that crossed from Russia it was reported. (Photo by Alexander Khudoteply/AFP Photo)

Alla Baygusheva shows a burnt door in her damaged house after fighting between militants and Ukrainian forces in eastern Ukrainian village Seleznevka, near of Slaviansk, in Ukraine, 17 August 2014. Alla Baygusheva and her husband Vitaliy were in Seleznevka during fierce fighting between militants and Ukrainian forces. According to local people more than 80 percent buildings in village were damaged. (Photo by Roman Pilipey/EPA)

A Ukrainian serviceman checks his Soviet-made armor-piercing rifle at a position on the roof of a building outside Donetsk, August 15, 2014. The European Union said on Friday it would consider any unilateral military actions by Russia in Ukraine as “a blatant violation of international law”. (Photo by Valentyn Ogirenko/Reuters)

A wounded man in a childrens playground after a mortar attack by the Ukrainian army of the center of Donetsk, Ukraine, 14 August 2014. Reports state that ten local people where wounded and one killed after the mortar attack. (Photo by Sergei Ilnitsky/EPA)

A woman collects belongings from her damaged home, in Khartsyzk, about 24 kms from Donetsk, Ukraine, 18 August 2014. (Photo by Sergei Ilnitsky/EPA)

A man stands in front of a damaged house, in Khartsyzk, about 24 kms from Donetsk, Ukraine, 18 August 2014. The Ukrainian National Security and Defence Council said separatist rebels fired on a refugee convoy near the eastern city of Luhansk. Russian Foreign Minister Sergei Lavrov said 18 August that a political settlement of the conflict in Ukraine was possible only if the government in Kiev halted its military campaign against separatist rebels in the east. (Photo by Sergei Ilnitsky/EPA)

Local men help a wounded woman after a mortar attack by the Ukrainian army of the center of Donetsk, Ukraine, 14 August 2014. Reports state that ten local people where wounded and one killed after the mortar attack. (Photo by Sergei Ilnitsky/EPA)

A man carries goods out of his burned shop after shelling in the town of Yasynuvata near the rebel stronghold of Donetsk on August 12, 2014. (Photo by Dimitar Dilkoff/AFP Photo)

Ukrainian servicemen, members of a special team, monitor pro-Russian militants' telecommunications in Donetsk region on August 16, 2014. (Photo by Anatolii Stepanov/AFP Photo)

A Ukrainian serviceman crawls behind a car during a shooting near the checkpoint of Debaltseve, in the region of Donetsk, on August 16, 2014. Diplomatic efforts to douse an international firestorm over claims that Ukraine's forces destroyed Russian military vehicles ratcheted up Saturday as Moscow demanded that Kiev allow its mammoth aid convoy to cross the volatile border. (Photo by Anatolii Stepanov/AFP Photo)

Ukrainian women sit beside a bus at the Donetsk-Izvarino border crossing, outside the Russian town of Kamensk-Shakhtinsky, Rostov region, some 30 km from the Russian-Ukrainian border on August 16, 2014. Diplomatic efforts to douse an international firestorm over claims that Ukraine's forces destroyed Russian military vehicles ratcheted up August 16 as Moscow demanded that Kiev allow its mammoth aid convoy to cross the volatile border. Some 280 trucks packed with what Russia claims is humanitarian aid waited for a third day some 30 kilometres (20 miles) from a rebel-held border post as Moscow and Kiev haggled over letting it across. (Photo by Sergei Venyavsky/AFP Photo)

A man crosses a street near a burned car in central Donetsk on August 16, 2014. Washington on Friday urged Moscow to stop its “extremely dangerous and provocative” activities after Ukraine said it had destroyed part of a Russian military convoy that entered its territory. (Photo by Max Vetrov/AFP Photo)

A Pro-Russian rebel camouflages a weapon at a position on the frontline near the village of Krasnodon, eastern Ukraine, Friday, August 15, 2014. Russia let Ukrainian officials inspect an aid convoy while it was still on Russian soil Friday and agreed that the Red Cross can distribute the goods in Ukraine's rebel-held city of Luhansk. (Photo by Sergei Grits/AP Photo)

A woman walks past Ukrainian government soldiers from battalion “Donbass” guarding an entrance of a shop in village Mariinka near Donetsk, eastern Ukraine, Monday, August 11, 2014. The Red Cross will lead an international humanitarian aid operation into Ukraine’s conflict-stricken province of Luhansk with assistance from Russia, the European Union and the United States, Ukraine said Monday. (Photo by Evgeniy Maloletka/AP Photo)

Pro-Russian rebels greets each other as they ride on a tank near the town of Krasnodon, eastern Ukraine, Saturday, August 16, 2014. Tanks and APC's manoeuvre on the Ukrainian side of Ukrainian-Russia border as the humanitarian convoy on the other side of the frontier is still unmoved. (Photo by Sergei Grits/AP Photo)

Local residents sit in a basement used as a shelter from artillery fire, in the settlement of Makiivka, on the outskirts of Donetsk, August 19, 2014. Artillery fire could be heard on Tuesday in Makiivka, on the eastern outskirts of the rebel-controlled city of Donetsk, Reuters reporters at the scene said. (Photo by Maxim Shemetov/Reuters)

A Ukrainian Mi-24 helicopter flies close to a military camp in Kramatorsk town, near Slaviansk, Ukraine, August 19, 2014. The Ukrainian National Security and Defence Council said that separatist rebels fired on a refugee convoy near the eastern city of Luhansk. Russian Foreign Minister Sergei Lavrov said August 18 that a political settlement of the conflict in Ukraine was possible only if the government in Kiev halted its military campaign against separatist rebels in the East of the country. (Photo by Roman Pilipey/EPA)

A man comforts his mother as they walk past the body of man lying on the pavement after shelling in the town of Makiyivka on August 19, 2014. Ukraine said Tuesday that fighting had erupted in the heart of the major rebel stronghold of Lugansk as government forces pressed on with a punishing offensive to win back the war-torn east. (Photo by Dimitar Dilkoff/AFP Photo)