Putin Orders All Russian Troops Out Of Syria During Surprise Visit After Iran Issues Ultimatum To US
http://www.whatdoesitmean.com/index2451.htm
There are many open questions w.r.t. US troops in Syria How many, in which places, what do they do, what is their goal,...
In the text there are many links, to separate questions, who ever wants to explore the situation can follow the links.
In the text You also find the background story of the war in Syria.