I would say/hope that what Erdogan is saying is nothing more than a bluff to play off the US (and even Germany for that matter) against Russia to improve ties but based on what happened with the S400s, its quite possible that some of what he mentioned in terms co-operation actually does happen.......
He has spoken on S-400, we thought it was a bluff, then it happened and caused a catastrophe,
He again speaks on several matters, i am sure these will somehow happen and cause worse catastrophic events than before.
Despite of CAATSA and other sanctions, embargo, the cooperation - partnership is still happening in the background off-the eyes, If this happens it will go worse and diminish.
and Russian despite of acting as a "friend" will never contribute as much as the "enemy-threat like" west, even in the best-case scenario.
Checking Syrian thread will tell us much better about how "friendly" Russians are.