Estonian President Toomas Hendrik Ilves (left), with intelligence officer Eston Kohver in 2010. Kohver was arrested by Russian police on spying charges, but Estonian officials called it an illegal kidnapping. AP hide caption

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Mothers and wives of Russian paratroopers captured in Ukraine wait for information outside their base in Kostroma, Russia. Russia's military has been challenged to explain an upsurge in dead and missing soldiers from its elite units. Dmitry Serebryakov/AFP/Getty Images hide caption

itoggle caption Dmitry Serebryakov/AFP/Getty Images

Ukrainian coal miners search the crash site of the Malaysia Airlines plane near the eastern village of Rozsypne. The area is under the control of pro-Russian separatists who are fighting the Ukrainian government. Dmitry Lovetsky/AP hide caption

itoggle caption Dmitry Lovetsky/AP