Leftists used to have a consistent ideology. Today, their ideology is any enemy of America is a friend of mine. That’s why you have a left-wing website like Global Research, that would normally be against all organized religion, defending Iran’s theocratic regime.
Fine, you hate that source.
Here’s another:
https://en.wikipedia.org/wiki/Qatar%E2%80%93Turkey_pipeline
Here’s a right-wing site with the same information:
https://www.zerohedge.com/news/2016-10-24/oil-gas-war-over-syria-4-maps
And I can go on. In any case the pipeline issue is the crux of why so many players are going into the power vacuum in Syria that the USA absolutely created by arming the rebels who became ISIS and using them as a proxy to overthrow Assad.