The Suadi’s/Qatari’s interest is putting an overland gas pipeline through ISIS territory and Turkey to Europe. With healthy royalties for Turkey.
The Russians (via their Shia proxies in Iran/Syria and now Iraq) interest is stopping this pipeline at all cost as it undermines their near monopoly on proving gas to Europe and the influence associated with such.
Saudi, Qatar, USA, Syrian Rebels, ISIS and Turkey...VS...Syria, Iran, Lebanon (Hezzbulah), and Russia.
Trying to remain, or at least appear neutral: Kurds, Jordan and Kuwait.
The Kurds aren’t that neutral. They also need to move their oil through Turkey. They are currently opposed by Baghdad -which continues to claim Kurdish territory and resources as its own, and ISIS with whom they’re still working out the Kurdistan-Sunnistan border.