Russian air defense system accompanied 'convoy' in Donetsk - U.S. ambassador

A Russian air defense system was working next to a "separatist convoy" in Donetsk. U.S. Ambassador to Ukraine Geoffrey Pyatt reported this on his Twitter page.

"We have information that a Russian air defense system was operating near a separatist convoy in Donetsk - suggests Russian forces were protecting," he wrote.

He did not explain what kind of convoy he meant.