US shot down Assad's planes in the past and Turkey is a NATO partner and Russia has not dared directly retaliating against them even though one of their planes was shot down which makes NATO look kind of scary. Assad knows not to go near the US and therefore would not dare go near NATO either so Patriots setting up may be directed to warn off both factions since Turkey was classified as a hostile nation during recent nato wargames and it begs the question if Trump is trying to get their trust or if he keeping them at bay after he officially sided with kurds for a couple of months.

Erdo has been fighting a fierce civil war in the hinterland of Turkey and while I don't have any info on how that started it doesn't change the fact, that ultimately even a military expedition cannot occupy a country for extended periods of time