Which is why MbS may have started the fight, since Russia is continually meddling in Saudi affairs, and supporting long time Saudi enemies.
Add in a proposed pipeline through Syria that is blocked, and MbS has his reason to start the oil war.
Saudi's may pull it out of the ground cheaper, but they have every dollar accounted for up $84/a barrel.
If it stays lower than that for very long, MBS may have to answer to a lot of angry cousins.