Temporary alliances of convenience among blood enemies may seem illogical to an ordered Western mind, and even more so to us black hats bad, white hats good Yankees, but it's commonplace in that region.
ISIS, ISIL, DAESH, Al Qaeda, whatever name of the month is applied to the forces opposing Asaad, are entirely Sunni operations with the occasional collaborations of convenience, for America's and Israel's detriment, with Shia Iran. Their real back door support remains our "friends", the Saudi's, whose own claims of preeminence are based on Sunni control and protection of the Islamic "Holy Sites".
Like I said, by Middle East standards things are pretty straight forward. But that doesn't mean they're not complex and fluid. It's never easy to sort out, but watching complete imbeciles like Obama, Hillary Clinton, Kerry, and the late Senator Songbird of Arizona get involved before some sanity was restored in 2017 was scary.
Largely agree with what you said.
I believe that Putin and Trump have an unspoken understanding of both of their interests and neither wants a direct conflict with each other.
If some stability is restored, it will be done by common will of the US and Russia to have it happen. I hope it can.
Do I trust Putin? No. But I do trust them to act in their own interests. They have disappointed me by what they allowed in Efrin (Afrin). Now that is largely past and Turkey looks terrible from the exposure of their actions.
Will there be an alliance between Turkey and Russia? Not in a traditional sense, but in a sense of mutual interests. Oil, the strait, bases and regional influence. I don’t think Putin likes Erdogan and I think he will play with him for a while before using him.