REUTERS

"The Syrian army is being trained in the use of these weapons. In fact, the army has started using some of these [weapon] types," the source said in response to a question about Russian support.

The source described the weapons as "highly accurate and effective, and hit targets precisely."

The source declined to give further details about the weapons.

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As UNIAN reported earlier, the United States identified a small number of Russian helicopters at a Syrian airfield, although it was not clear when the Russian helicopters had arrived there.

The U.S. and NATO have raised concerns over Russia's military buildup in Syria.