This whole attack on Assad was only to get a pipeline from Saudi Arabia to Turkey.
The pipeline was a symbol of what is more important: Saudi, Qatari, US, Turkish and western companies and banks hegemony to replace the influence of Iran and Russia
I believe they want a pipeline to get Caspian oil to the Mediterranean. It would have to run through Iran, Iraq, and Syria. Obama was buying off Iran to allow the oil to flow to us and away from Russia. This is pure supposition on my part, but fits the events of the last 25 years.