He definitely has at least the means of applying pressure.

How do you know he isn’t? These things don’t necessarily happen in open view.

Completely freeze military cooperation and weapon deliveries and withdraw the Carriers they send would be possible after talks failed.

That’s up to Congress. Unless you want it legal for the President to ask for a favor again.

Edit to add: I especially like the Carrier part. The only thing stopping this from becoming a regional war are those battle groups. You seem to think that inviting Iran to the table would be a good thing.