The eternal Sunni-Shiite conflict is behind so much that goes on in the Middle East/Iran.
So even though the Saudi Arabia Sunni rulers fear the Jihadist-ISIS they backed them in Syria because they were fighting Assad who is an Iranian thus Shiite ally. This same ISIS is now taking back Sunni areas from the weak Malaki Shiite rule emanating out of Baghdad. This northern Sunni area of Mosul has oil wells to finance this new ISIS trans Iraq-Syria government.
ISIS has backhoes and bulldozers demolishing border markers on the Iraq-Syria line as part of them proclaiming they are a transnational Islamic Jihad movement intent on re-establishing the transnational Caliphate
Precisely why we need to drill drill drill, so we can extricate ourselves from that god-forsaken part of the world.