Well its a complicated one, in that if they aren't US allies, they aren't Russian ones either. Ive come around to the idea that minimising the potential exposure of F35 is no bad thing, but is it going to be worth it if we end up pushing this clueless bugger into Russia's arms? Probably not.
As for a mechanism to withdraw people from NATO, thats a dangerous course I dont want. Because if there WAS, you know Russia would go balls out to try and get us to backtrack from Eastern Europe. More to the point, the American President would be exploiting the same rules to withdraw from defending people he sees no value in, such as Montenegro.
Maybe we will get lucky and Erdogan will just get run over by a bus. It seems to me his political career is already on the skids anyway, so he would probably be doing himself a favour.