If you hear the words "foreign troupes" you should feel a tingle go up your spine. Any time a government uses foreign troupes on their own soil it is to kill their own people. It has become commonplace for countries in the middle east to have a standing army in another country. They live, work, and fight for that other country. Many times, the fight is against the people of the second country.
If you are a poorly paid and poorly treated member of an army and you are dropped in a foreign country that you didn't really like in the first place, you will be far more willing to drop a hammer on civilians than if you are a couple blocks away from the neighborhood where you grew up. This fact has been used for ever. I remember a movie where a king of England wanted French troupes to suppress a rebellion from some duke or whatever. This story may have been Robin Hood for all I remember.
Qaddafi used many foreign troupes in this most recent rebellion. Many were from African nations to the south. Many did not speak the local language. I suppose if your job is to kill the locals and stop a rebellion not knowing the language might be a plus. Someone screaming that their child is in trouble would roll off you like water off a duck's back.
At some point recently, during war games on U. S. soil, foreign agents of law enforcement and possibly military have been spotted. It goes down as one agency learning from another. Someone said the word "adviser" when referring to the foreigner troupes on U. S. soil. I really hope that is all it was.