Members of a joint investigation team present the preliminary results of the criminal investigation into the downing of Malaysia Airlines Flight 17 in 2014. The investigators said Wednesday they have confirmed that MH17 was shot down by a Buk missile fired from rebel-held areas in Ukraine. Emmanuel Dunand/AFP/Getty Images hide caption

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Ukrainian pilot Nadiya Savchenko (center), who was freed from jail in Russia as part of a prisoner exchange, talks to the media upon arrival at Kiev's Boryspil airport on Wednesday. Anatolii Stepanov /AFP/Getty Images hide caption

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Journalists walk near parts of Malaysia Airlines flight MH17 near the Grabove village in eastern Ukraine on Nov. 11, 2014. MENAHEM KAHANA/AFP/Getty Images hide caption

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MENAHEM KAHANA/AFP/Getty Images

Russian Military Involved In Shooting Down Flight MH17, Researchers Say

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Employees prepare a convoy of four trucks transporting warm clothes and shoes to refugees in Ukraine, at the initiative of the French Red Cross, on Feb. 26 in Saint-Quentin-Fallavier, France. JEAN-PHILIPPE KSIAZEK/AFP/Getty Images hide caption

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JEAN-PHILIPPE KSIAZEK/AFP/Getty Images

Ukrainians Who Fled To Russia Find The Welcome Is No Longer Warm

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Ukrainian pilot Nadezhda Savchenko applauds and smiles in a glass cage inside court ahead of the verdict in the town of Donetsk, Rostov-on-Don region, Russia, on Tuesday. Ivan Sekretarev/AP hide caption

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Ukrainian deputy minister of health Igor Pereginets holds a 2-year-old getting a polio vaccination in Kiev on October 21 — part of a campaign launched after two cases were reported in September. Genya Savilov/AFP/Getty Images hide caption

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An honor guard soldier stands next to a monument in Bucharest, Romania, in Feb. 2012, that bears the names of Jews killed when the SS Struma — the ship they were on as refugees on their way to what was then Palestine — was sunk by a Soviet torpedo in the Black Sea. All but one of the 779 people on board died. Vadim Ghirda/AP hide caption

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Russian President Vladimir Putin (right) greets Syrian President Bashar Assad in the Kremlin in Moscow on Tuesday. It was Assad's first known trip abroad since the Syrian war broke out in 2011. To bolster Assad, Russia recently began bombing opposition groups in Syria. However, Russian efforts to help embattled leaders have often failed. Alexei Druzhinin/AP hide caption

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Alexei Druzhinin/AP

Part of the reconstructed Malaysia Airlines Flight 17 plane is seen prior to the presentation of the Dutch Safety Board final report on what caused the Boeing 777 to break up high over eastern Ukraine last year. Peter Dejong/AP hide caption

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Peter Dejong/AP

Two polio cases have been reported in Ukraine, where some parents are fearful of vaccinations. Above: A child receives the diphtheria, whooping cough and tetanus vaccine in a children's hospital in Kiev. Sergei Chuzavkov/AP hide caption

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Sergei Chuzavkov/AP

Russian workers threw contraband peaches off a truck outside the city of Novozybkov on Aug. 7. AFP/Getty Images hide caption

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Russia's War On Western Food: Detaining Cheese, Crushing Frozen Geese

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In Nieuwegein, Netherlands, on Friday, relatives and friends of victims gather in front of a "hedge of compassion" made of thousands of stuffed animals during a commemoration of the victims of the Malaysia Airlines MH17 plane crash in eastern Ukraine. Michael Kooren/EPA/Landov hide caption

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Michael Kooren/EPA/Landov