Russia will soon kill Americans in Syria unless President Trump issues a clear and definitive red line against such action. He must warn Russian President Vladimir Putin that even if Moscow uses a proxy to carry out an attack, Russia will be held directly responsible.

Last Tuesday, a number of United States military personnel were injured when a Russian Army convoy rammed its vehicle. Over the weekend, there were reports that Syrian proxies mortared a U.S. base just north of the Euphrates River. In mid-August, Syrian forces under Russian control opened fire on a U.S. patrol. In February, another U.S. patrol rightly forced a Russian Army vehicle off the road when it obstructed the U.S. route of travel. And as proven by a failed February 2018 Russian GRU attack on U.S. forces, we know that if he believes he can get away with it, Putin is willing to kill Americans in Syria.