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Pro-Russian rebels ride on a tank flying Russia's flag, on a road east of Donetsk, 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)
Pro-Russian rebels ride on a tank flying Russia's flag, on a road east of Donetsk, 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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U.S. has proof Russia firing into Ukraine

The United States said it has 'evidence that Russia is firing' into Ukraine. CNN's Barbara Starr reports.

U.S. has proof Russia firing into Ukraine

The United States said it has 'evidence that Russia is firing' into Ukraine. CNN's Barbara Starr reports.