Ukraine

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** FILE ** A pro-Russian soldier is back dropped by Russia flag while manning a machine-gun outside an Ukrainian military base in Perevalne, Ukraine, Saturday, March 15, 2014. (Associated Press)

Local residents sit in a basement which is being used as a shelter after shelling in Donetsk, eastern Ukraine, Wednesday, Aug. 20, 2014. After days of street battles and weeks of shelling, Ukrainian troops made a significant push Wednesday into rebel-held territory, claiming control over a large part of the separatist stronghold of Luhansk and nearly encircling Donetsk, the largest rebel-held city. (AP Photo/Max Vetrov)

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** FILE ** Mark Paslawsky died Tuesday, Aug. 19, 2014 while fighting with Ukraine's volunteer force in Donbas. (YouTube, Vice News)

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Deputy National Security Adviser Tony Blinken speaks about Russia, Ukraine as well as the Middle East conflict during an appearance at the daily press briefing at the White House in Washington, Monday, July 28, 2014. (AP Photo/Jacquelyn Martin) **FILE**

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Russian President Vladimir Putin has lambasted those who use the downing of a passenger jet in eastern Ukraine for "mercenary objectives." The Kremlin said Mr. Putin also lashed out at Ukraine for ongoing violence with pro-Russia separatists in the eastern part of the country. (RIA-Novosti via Associated Press)

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Malaysian air crash investigators walk by wreckage at the crash site of Malaysia Airlines Flight 17 near the village of Hrabove, eastern Ukraine, Tuesday, July 22, 2014. A team of Malaysian investigators visited the site along with members of the OSCE mission in Ukraine for the first time since the air crash last week.(AP Photo/Vadim Ghirda)

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A man covers his nose to avoid the smell of bodies as members of the OSCE mission to Ukraine and Holland's National Forensic Investigations Team inspect a refrigerated train, seen in background, loaded with the bodies of passengers in Torez, eastern Ukraine, 15 kilometers (9 miles) from the crash site of Malaysia Airlines Flight 17, Monday, July 21, 2014. Another 21 bodies have been found in the sprawling fields of east Ukraine where Malaysia Airlines Flight 17 was downed last week, killing all 298 people aboard. International indignation over the incident has grown as investigators still only have limited access to the crash site and it remains unclear when and where the victims' bodies will be transported. (AP Photo/Vadim Ghirda)

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A difficult duty: The stench of death was nearly overwhelming Monday as Alexander Hug (center right), deputy head of the Organization for Security and Cooperation in Europe, led a forensics investigation team near the crash site of Malaysia Airlines Flight 17 in eastern Ukraine. (Associated Press)