President Obama said at a White House news conference Thursday that Russia is to blame for the violence in eastern Ukraine. Larry Downing /Reuters /Landov hide caption

itoggle caption Larry Downing /Reuters /Landov

A Sich special volunteer battalion member attends an oath-taking and farewell ceremony in Kiev on Tuesday. The battalion is leaving the Ukrainian capital to take part in anti-terrorists operation in the east of the country. Sergei Supinsky /AFP/Getty Images hide caption

itoggle caption Sergei Supinsky /AFP/Getty Images

Ukrainian soldiers muster at a point close to Luhansk in eastern Ukraine on Wednesday, as Ukrainian troops make a push into rebel-held territory. Petro Zadorozhnyy/AP hide caption

itoggle caption Petro Zadorozhnyy/AP

A Ukrainian MiG-29 fighter jet flies over Slovyansk, Ukraine, in May. Ukrainian officials acknowledged the same type of aircraft was shot down Sunday over the country's east. Alexander Ermochenko/AP hide caption

itoggle caption Alexander Ermochenko/AP

A Ukrainian soldier cleans his armored personnel carrier near Donetsk in eastern Ukraine on Monday. Russia says a large convoy that's heading to the area from Moscow is carrying humanitarian aid. Anatolii Stepanov/AFP/Getty Images hide caption

itoggle caption Anatolii Stepanov/AFP/Getty Images

A woman removes debris from a cafe that was destroyed during fighting between Ukrainian forces and pro-Russian militants Aug. 5 in the eastern Ukrainian city of Slavyansk, in the region of Donetsk. Anatolii Stepanov/AFP/Getty Images hide caption

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Australian Prime Minister Tony Abbott speaks during a news conference in Sydney last week. Abbott has announced the deployment of 190 police to help secure the MH17 wreckage site, where 37 Australians were killed. Rob Griffith/AP hide caption

itoggle caption Rob Griffith/AP

Pro-Russian rebels move journalists away from Malaysian investigators and monitors from the Organization for Security and Cooperation in Europe Tuesday. Malaysia Airlines flight MH17 was allegedly shot down by a missile Thursday; today, U.S. intelligence says it has verified that two rebel leaders spoke by phone about shooting the plane down. Rob Stothard/Getty Images hide caption

itoggle caption Rob Stothard/Getty Images

A pro-Russian rebel talks on a phone as a refrigerated train loaded with the bodies of victims from Flight MH17 leaves the station in Torez, eastern Ukraine, about 9 miles from the crash site of the Malaysia Airlines jetliner. Vadim Ghirda/AP hide caption

itoggle caption Vadim Ghirda/AP