How many sources would you like regarding the pipeline? Russia pipes gas to the whole of the EU, Qatar along with Iran share the single largest gas field in the world, both want to run a pipe via Syria to supply Europe, this is fact not fiction, Qatar does not like Iran and neither does America, Iran due to sanctions is slowly going bust so needs to be the supplier. I have written a post about this in the past, and will do so again now.
http://www.news.com.au/world/middle-east/is-the-fight-over-a-gas-pipeline-fuelling-the-worlds-bloodiest-conflict/news-story/74efcba9554c10bd35e280b63a9afb74
https://www.mintpressnews.com/migrant-crisis-syria-war-fueled-by-competing-gas-pipelines/209294/
https://www.zerohedge.com/news/2016-10-24/oil-gas-war-over-syria-4-maps