Originally Posted by
Lonewolf_50
Erdogan sees a situation that he can turn to his advantage, so he's going to make the most of it.
^ this.
If he said that having Sweden and Finland in NATO was a fundamentally bad idea, we might have an intractable problem, but that's not the case at all. If he's saying "I won't support their membership unless XYZ" he's not fundamentally opposed, and it's therefore negotiable. Ditto Croatia.