Turkey wouldn’t be flying in that airspace without Russia’s permission.
I expect Russkie will turn a blind eye to an incursion to take on the Kurds. When it comes to taking over Syria though, they’ll have to go through Putin.
Yes, Turkey and Russia made up. They must be allies when Ezekiel 38 happens some time in the future. Another article says right now they are “friends” but not “allies”.
Yes, it’s The Atlantic - there are other articles on this.
https://www.theatlantic.com/news/archive/2016/08/turkey-russia-ties/495020/
Resetting Turkey’s Ties With Russia