**Two Russian airmen killed in Syria on Friday were shot down with American weaponry, the Interfax news agency said Sunday, quoting a Russian military source.
It said insurgents from the Islamic State group hit the airmen’s Mi-25 assault helicopter with a U.S.-made TOW heavy anti-tank missile, a weapon that uses guidance from a ground station.
The high-tech system is in service with the U.S. military.**
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