Ukrainian soldiers sit on an armored vehicle as they take up a position in a sunflower field near Donetsk, Ukraine, on Thursday, July 10. Here's a look at the upheaval that has persisted in eastern Ukraine since the election of President Petro Poroshenko. DOMINIQUE FAGET/AFP/Getty Images
A man rides a bike past the tail of a bombshell outside Slovyansk, Ukraine, on July 10. Dmitry Lovetsky/AP
Eugenia Gubareva cries on July 10 after finding clothes belonging to her parents, who were killed during a bomb shelling in Mikolaivka, Ukraine. Dmitry Lovetsky/AP
A man cleans up debris in his apartment after a shelling in Slovyansk on July 10. Evgeniy Maloletka/AP
People walk under a destroyed railroad bridge near the village of Novobakhmutivka on Monday, July 7. Dmitry Lovetsky/AP
A woman cries as her house burns after a bombing in Slovyansk on Monday, June 30. Dmitry Lovetsky/AP
People say goodbye to volunteer soldiers in Kiev, Ukraine, before they leave for the eastern part of the country to join the ranks of a special battalion on Monday, June 23. Sergei Chuzavkov/ap
People take refuge in a bomb shelter during clashes between Ukrainian troops and pro-Russia fighters in Slovyansk on Sunday, June 22. Andrei Petrov/ap
Riot police surround the Kiev Pechersk Lavra, an Orthodox Christian monastery in Kiev where radical masked activists gather to protest against separatists on June 22. Sergei Chuzavkov/ap
Ukrainian President Petro Poroshenko awards wounded soldiers with state awards in a military hospital in Kiev on Saturday, June 21. Mykhailo Markiv/ap
Debris lies scattered at an airport in Luhansk, Ukraine, on Saturday, June 14, after the crash of a Ukrainian Ilyushin-76 military transport plane. A military spokesman said the aircraft was shot down by pro-Russian separatists, killing all 49 aboard. Evgeniy Maloletka/AP
A pro-Russian fighter collects ammunition from the debris of the downed military aircraft on June 14. Evgeniy Maloletka/AP
Pro-Russian fighters walk past the wreckage of the downed aircraft. Evgeniy Maloletka/AP
A military vehicle was destroyed during a clash between Ukrainian troops and pro-Russian separatists Friday, June 13, in Mariupol, Ukraine. Ali Atmaca/Anadolu Agency/Getty Images
Locals in Mariupol gather around a burning military vehicle at the site of a battle between Ukrainian troops and pro-Russian fighters on June 13. Evgeniy Maloletka/AP
A pro-Russian fighter in Slovyansk checks a woman's documents as she leaves the city on Thursday, June 12. Evgeniy Maloletka/AP
A pro-Russian fighter stands guard at a checkpoint in Slovyansk on June 12. Evgeniy Maloletka/AP
A girl looks out of a bus window as she leaves Slovyansk on Monday, June 9. Evgeniy Maloletka/AP
Poroshenko holds the ceremonial mace during his inauguration ceremony Saturday, June 7, in Kiev. Poroshenko was elected three months after the ouster of former President Viktor Yanukovych. Anastasia Sirotkin/Pool/AP
A Ukrainian tank opens fire during a battle with pro-Russian separatist fighters in Slovyansk on Friday, June 6. Efrem Lukatsky/AP
A Ukrainian soldier prepares explosives during a battle with pro-Russian separatists in Slovyansk on June 6. Efrem Lukatsky/AP
A Ukrainian soldier observes the road at a checkpoint outside of Amvrosiivka, Ukraine, on Thursday, June 5. Vadim Ghirda/AP
Ukrainian soldiers take position during a battle with pro-Russian separatists outside Slovyansk on June 5. Efrem Lukatsky/AP
Pro-Russian militants stand guard at a barricade and checkpoint in Donetsk on Sunday, June 1. VIKTOR DRACHEV/AFP/Getty Images
A Ukrainian soldier shoots a grenade launcher during a battle with pro-Russian separatists in Slovyansk on Saturday, May 31. Efrem Lukatsky/AP
A protester from Kiev's Independence Square gestures May 31 as fellow protesters burn tires to protect their barricades from being dismantled by communal services. SERGEI SUPINSKY/AFP/Getty Images
A Ukrainian armored personnel carrier takes position during a battle with pro-Russian separatist fighters May 31 in Slovyansk. Efrem Lukatsky/AP
Ukrainian soldiers rest at a checkpoint outside Slovyansk on Thursday, May 29. Efrem Lukatsky/AP
Smoke rises from a shot-down Ukrainian Army helicopter outside Slovyansk on May 29. Alexander Zemlianichenko/AP
A man stands in front of a truck that was bombed by Ukrainian soldiers during clashes with armed rebels Tuesday, May 27, in Donetsk. FABIO BUCCIARELLI/AFP/GETTY IMAGES
Medical staff prepare to clean the body of a pro-Russian militant at the Kalinina morgue in Donetsk on May 27. FABIO BUCCIARELLI/AFP/GETTY IMAGES
The body of a pro-Russian militant lies on a stretcher at a morgue in Donetsk on May 27. He was killed in clashes around Donetsk's airport, which was seized by pro-Russian separatists a day earlier. Ukrainian forces moved in and reclaimed the facility. Vadim Ghirda/AP
Firefighters work on extinguishing a fire at a local sports hall in Donetsk on May 27. FABIO BUCCIARELLI/AFP/GETTY IMAGES
People pile up sandbags to set up a shooting position on the road leading from the Donetsk airport on May 27. Vadim Ghirda/AP
A man dressed in a prisoner costume takes part in a protest against government corruption May 27 in Kiev. FILIP SINGER/EPA/LANDOV
Pro-Russian militants take position on the roof of Donetsk International Airport on Monday, May 26. Alexander KhudoteplyAFP/Getty Images
A pro-Russian militant takes position on the roof of the Donetsk airport on May 26. Alexander KHUDOTEPLY/AFP/Getty Images
A man runs for cover during fighting around the airport on May 26. Vadim Ghirda/AP
Smoke rises from the airport on May 26 after an airstrike by the Ukrainian military. Ivan Sekretarev/AP
Pro-Russian gunmen take positions near the airport on May 26. Vadim Ghirda/AP
Men stand next to pro-Russian militants as a woman runs away during clashes near the airport on May 26. FABIO BUCCIARELLI/AFP/Getty Images
A pro-Russian militant guards a checkpoint on May 26, blocking a highway that links the Ukrainian city of Kharkiv with Rostov-on-Don, Russia. Alexander Zemlianichenko/AP
A pro-Russian militant teaches recruits how to use a machine gun in Senyonovka, Ukraine, on May 26. VIKTOR DRACHEV/AFP/Getty Images
A woman walks May 26 near barricades built by protesters in Kiev's Independence Square. Vitali Klitschko, Kiev's future mayor and a former boxing champion, promised to dismantle the iconic protest encampment that helped oust Yanukovych but now clogs traffic and draws public complaints. SERGEI GAPONSERGEI GAPON/AFP/Getty images
Ukraine's newly elected president, Petro Poroshenko, talks alongside Klitschko, right, during a news conference in Kiev on May 26. Poroshenko, a billionaire candy tycoon known as the "Chocolate King," is a seasoned politician known for his pro-European Union views. Efrem Lukatsky/AP
Election commission officials count ballots at a polling station in Kiev on Sunday, May 25. Evgeniy Maloletka/AP
Artist Ivan Voronov, 91, and his wife, Svetlana Samoilechenko, 86, cast votes from their Kiev home on May 25. Dan Kitwood/Getty Images
An elderly woman casts her vote May 25 as a mobile Ukrainian election committee visited Orane, a village north of Kiev. ALEXEY FURMAN EPA//LANDOV
A woman holds the hand of a pro-Russian gunman in Donetsk's Lenin Square on May 25. A large separatist rally was held in Donetsk around lunchtime. The protesters chanted pro-Russian slogans as they were addressed by separatist leaders. Vadim Ghirda/AP