Syrian troops are now using weapons given to them by Russia.

A Syrian military source confirmed to Reuters Thursday, Russia had supplied the weapons that are more advanced than the weapons of the Syrians.

“New weapons are being delivered, and new types of weapons. 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 told Reuters.

“The weapons are highly effective and very accurate, and hit targets precisely,” the source added. “We can say they are all types of weapons, be it air or ground.”

U.S. officials say the buildup of Russian forces and equipment in Syria is going to do little more than destabilize an already perilous situation.

“[Russia’s actions are] counterproductive to the ultimate solution in Syria, which we think is a political and diplomatic solution, not a military solution,” Pentagon spokesman Peter Cook said at a press conference.

U.S. officials added they have confirmed the presence of Russian helicopter gunships but did not know when they arrived in Syria.