It has been pointed out that Saudi is not officially part of Nato, and thus Russian S400 operators may not feel motivated to exceptional restraint. And Russian aviators may still be carrying a grudge towards fighters operating out of Turkey
I don't think this topic really belongs here, but maybe someone should close civilian airspace above this mess before there is a repeat of the Ukraine incident.
A combat environment with multiple state actors with benzedrine-fueled military pilots flying live weapons, and the latest anti-aircraft tech, does not mix well with the quiet world of civil aviation which we all love. US, Russia, Uk, France, Syria, Turkey, Israel and now Saudi now all have fast jets operating within a few miles of each other, with live weapons, multiple aircraft carriers are in the region, and Russia has one of the most powerful ground to air systems emplaced. This is not a military parade for show, it is a tinderbox.
And besides, closing down air transport in the zone might make the various local VIPs realize that their actions threaten their own families as much as the hoi polloi.
Edmund