It is not the Arap Alawaites, but the Iranian faction of Shiite groups and elite groups that have been deprived of their "eliteness" that can finance mercenaries. They also don't refrain from hiring militias disguised as the armed forces of the new Syrian government and provoking local groups with the pressure.
Iranian militias take shelter in YPG / SDF occupied cities and travel freely to any desired city, both Israel, US and West watch this happening and only for the sake of destabilizing the rest of Syria.
While the West can theoretically end Iranian influence in Syria / Lebanon and cut off all border access, in practice they are using their arch enemy as a balancing power against Turkey and related groups that favor them.
As it seems, for sake balancing power of a NATO member, they favor free reach-out of Iranian militias through YPG.
Yes, So aim one is to utilise them against Turkiye, second aim is to break the majority power sunni islam from uniting. Iranian backed shia'ism will never be a threat to the western power structure, to the contrary it is the perfect catalyst for endless futile conflict that allows the west to expand. The houthi ballistic missiles that achieve nothing strategic are basically creating the argument to allow the occupation of those lands by the anglo-american world.
As many have pointed out in the past, its for this reason that the Azerbaijani Turks despite being oppressed in Iran under a despotic and backward theocratic regime are never spoken about in the west. While the Kurds who live their best lives in Turkiye are always spoken about as if a genocide by Turks is being conducted against them relentlessly. If their aim was to weaken Iran, 50% of their country is comprised of minorities who despise the regime. The western media never ever undermines iran via her own minorities except for the odd Kurdish outbreak.
Our counterbalance is going to be building up syria into a real functioning state with real military capabilities. This is going to be our buffer against Angol-American/Zionist designs for the region. But we are going to have to come to terms with the fact that the Zionist monster in the region has grand ambitions while the anglo-american/euro world constantly blows smoke up her arse hyping her up.
Also as a poster mentioned previously, if they feel they need to use Iran to further balance Turkish influance in the region they will make that state secularise. A secular Iran will economically, technologically and politically function far better then the current despotic theocratic regime. A strategy the west used to weaken muslim majority nations was always to institute a form of 7th century islam. An Islam that fails to take into account the realities of the time, but instead tries to operate along the lines of an era that long faded away with the advent of industrialisation.