My theory?
https://www.youtube.com/watch?v=Dqn0bm4E9yw
https://en.wikipedia.org/wiki/Operation_Cyclone

What are all those "democratic revolutions" in Lybia, Egypt and today in Syria?
What is the difference of this "Freedom Fighters" from Bin Laden and talibans?
Who pay for this and who deliver weapons?

http://www.wsj.com/articles/u-s-readies-plan-b-to-arm-syria-rebels-1460509400

Who deliver to ISIS the weapon for Russian helicopter downing?
There was a Russian and Muslim killed.
https://www.youtube.com/watch?v=efUwBqYdcrs