[quote=spdrun]Ucodgen- Reports and the Ukrainian government have at least one of the transports being shot down at 6,500 m or 21,000 ft. Too high for a manpad.[/quote]

Reuters is reporting that the system used was either an SA-11 Gadfly, or an SA-17 Grizzly, both successors to the Cold War SA-6 Gainful. These are tracked vehicles carrying a mounted rack of surface-to-air missiles capable of bringing down a commercial jetliner.

According to Jane’s, both Ukrainian and Russian forces have these.