Flowers cover the coffin of 17 year-old Vadim Papura during a religious service outside the apartment block where he lived, in Odessa, Ukraine, Tuesday, May 6, 2014. Papura died after jumping out of the burning trade union building in an attempt to escape Friday's fire that killed most of the 40 people that died after riots erupted last Friday.(AP Photo/Vadim Ghirda)
The girlfriend of Andrei Brazhevskiy, a pro-Russian activist, kisses him before the coffin is closed during the funeral in Odessa, Ukraine, Wednesday, May 7, 2014. Brazhevskiy, 27, died after jumping out of the burning trade union building in an attempt to escape Friday's fire that killed most of the 40 people that died after riots erupted last Friday. Girlfriend's name is not available. (AP Photo/Vadim Ghirda)
Relatives mourn in front of the casket of a person killed during clashes between Ukrainian and pro-Russian forces last week, during a commemoration service in the center of Slovyansk, eastern Ukraine, Wednesday, May 7, 2014. The U.S. and European nations have increased diplomatic efforts ahead of Ukraine's May 25 presidential election, as a pro-Russian insurgency continues to rock the country's eastern regions. (AP Photo/Darko Vojinovic)
Ukrainian Prime Minister Arseniy Yatsenyuk stands in front of Ukrainian soldiers at a block post on the road at Slovyansk, Ukraine, Wednesday, May 7, 2014. Ukrainian military operations that began Monday to expunge pro-Russia forces from the city of Slovyansk were the interim government's most ambitious effort so far to quell weeks of unrest in Ukraine's mainly Russian-speaking east. (AP Photo/Andrew Kravchenko, Pool)
A woman looks at a Ukrainian armoured personnel carrier at a checkpoint in Mariupol, eastern Ukraine May 7, 2014. Ukrainian forces seized the rebel-held city hall in the eastern port city of Mariupol overnight, driving out pro-Russian activists, then with
Pro-Russian gunmen carry the coffin of a person killed during last week's operation, during a commemorative service in the center of Slovyansk, eastern Ukraine, Wednesday, May 7, 2014. The U.S. and European nations have increased diplomatic efforts ahead of Ukraine's May 25 presidential election, as a pro-Russian insurgency continues to rock the country's eastern regions. (AP Photo/Darko Vojinovic)
Local citizens and their children hold posters that read: "Ukrainian Regional Security Service, Here is my Home" and "Kiev, Do Not Shoot", during anti-war action in Slovyansk, Ukraine, Wednesday, May 7, 2014. Ukrainian military operations that began Monday to expunge pro-Russia forces from the city of Slovyansk were the interim government's most ambitious effort so far to quell weeks of unrest in Ukraine's mainly Russian-speaking east. (AP Photo/Alexander Zemlianichenko)
Young Ukrainian recruits march near the infantry school in Donetsk, Ukraine, Tuesday, May 6, 2014. The foreign ministers of Ukraine and Russia met Tuesday, but their open disagreements did nothing to suggest a diplomatic solution was near. (AP Photo/Manu Brabo)
Local citizens collect parts of a downed Ukrainian military helicopter near a small town Raigorodok, outside Slovyansk, Ukraine, Tuesday, May 6, 2014. The helicopter was forced to make an emergency landing Monday during intense fighting in Slovyansk and was later destroyed by Ukrainian troops, who sought to ensure it did not fall into the hands of insurgent forces. (AP Photo/Darko Vojinovic)
An elderly relative is comforted as the coffin of 17 year-old Vadim Papura is brought outside the apartment block he lived in, in Odessa, Ukraine, Tuesday, May 6, 2014. Papura died after jumping out of the burning trade union building in an attempt to escape Friday's fire that killed most of the 40 people that died after riots erupted last Friday. (AP Photo/Vadim Ghirda)
Young Ukrainian recruits march near the infantry school in Donetsk, Ukraine, Tuesday, May 6, 2014. The foreign ministers of Ukraine and Russia met Tuesday, but their open disagreements did nothing to suggest a diplomatic solution was near. (AP Photo/Manu Brabo)
A man takes a picture of graffiti reading, "Russian - yes, NATO - no" with his cell phone in the center of Slovyansk, Ukraine, Tuesday, May 6, 2014. Gunbattles took place at various positions around the city Monday in what has proven the most ambitious government effort to date to quell unrest in the mainly Russian-speaking east. (AP Photo/Alexander Zemlianichenko)
A man rides a bicycle past a sign reading "Slovyansk" and charred remains of a truck on a road leading into Slovyansk, eastern Ukraine, Tuesday, May 6, 2014. Interior Minister Arsen Avakov gave the death toll on his Facebook page Tuesday, adding that 20 government troops were also injured during fighting in Slovyansk, a city of 125,000. It was not exactly clear when the deaths took place. Gunbattles around the city Monday were the interim government's most ambitious effort to date to quell weeks of unrest in Ukraine's mainly Russian-speaking east. (AP Photo/Darko Vojinovic)
A man cries after walking by the coffin of regional parliament member Vyacheslav Markin, in Odessa, Ukraine, Monday, May 5, 2014. Markin, who was known for speaking out against the government in Kiev, was buried on Monday while about 300 pro-Russian supp
A Pro-Russian man prepares molotov cocktails near the town of Slaviansk, eastern Ukraine, May 5, 2014. Pro-Russian separatists ambushed Ukrainian forces on Monday, triggering heavy fighting on the outskirts of the rebel stronghold of Slaviansk, Interior M
Pro-Russian armed men ride on top of an armored personnel carrier near Slovyansk, eastern Ukraine, May 5, 2014.
Mourners and family members mourn 21-year old nurse Yulia Izotova during the funeral in Kramatorsk, Ukraine, Monday, May 5, 2014. Witnesses say Izotova was killed by shots from a Ukrainian military column on the road near Kramatorsk. Ukrainian troops foug
Mourners grieve at the coffin of Vyacheslav Markin, a regional parliament deputy who died in a fire at the trade union building on Friday, at his funeral in Odessa, Ukraine, on May 5, 2014.
An elderly woman watch as a group of pro-Russian demonstrators storm the military Prosecutor's Office in Donetsk, Ukraine, May 4, 2014.
Pro-Russia protesters storm the governor's business premises in Donetsk, eastern Ukraine, May 3, 2014.
Pro-Russian protesters celebrate on top of a truck at a police station in Odessa, Ukraine, Sunday, May 4, 2014. Several prisoners that were detained during clashes that erupted Friday between pro-Russians and government supporters in the key port on the B
A pro-Russian protester fires a fire extinguisher at riot police inside at a police station building in Odessa, Ukraine, Sunday, May 4, 2014. Several prisoners that were detained during clashes that erupted Friday between pro-Russians and government suppo
A woman cries inside the burnt trade union building, in Odessa, Ukraine, Sunday May 4, 2014, where people died in in a fire that tore through the building. More than 40 people died in riots two days earlier, some from gunshot wounds, but most in a horrifi
A man holds carnations through a broken window of a burnt trade union building, the site of recent street battles between pro-Russian and pro-Ukrainian supporters, in the Black Sea port of Odessa May 4, 2014.
Ukrainian police officers remove shields which their comrades from another unit layed down earlier outside the police headquarter in Odessa, Ukraine, Sunday, May 4, 2014. Hundreds of pro-Russian demonstrators stormed police headquarters in Odessa on Sunda
Pro-Russia protesters storm the governor's business premises in Donetsk, Ukraine, May 3, 2014.
Austrlijanac Ovens Rajt na svetskom takmičenju u surfingu, održanom na polinezijskom ostrvu Tahiti, kojim upravlja Francuska. 24., avgust, 2015.
Russia's presidential human rights ombudsman Vladimir Lukin watches as foreign military observers hug each other following their release in Slovyansk, eastern Ukraine, May 3, 2014.
Smoke billows from burning tires at a pro-Russian checkpoint with a Donetsk republic flag following an attack by Ukrainian troops in Kramatorsk, Ukraine, May 3, 2014.
A protester walks past a burning pro-Russian tent camp near the trade union building in Odessa, Ukraine, May 2, 2014.
An injured pro-Russian activist looks on during clashes with supporters of the Kyiv government in the streets of Odessa, Ukriane, May 2, 2014.
People wait to be rescued on upper levels of a trade union building in Odessa, Ukraine, May 2, 2014.
A pro-Russian separatist guards a checkpoint as tires burn in front of him, near the town of Slovyansk, Ukraine, May 2, 2014.
Pro-Russian gunmen listen to instructions from their commander (center) behind barricades in Slovyansk, May 2, 2014.
A pro-Russian rebel aims his rifle at a checkpoint near a Ukrainian airbase in Kramatorsk, eastern Ukraine, May 2, 2014.