Nope because the folks in his cabinet might come to their senses and stop the POS, plus he's unpredictable.He's bluffing.
I'll make you a bet. I say he'll never invade militarily, you say he will.
Wanna make it a sig bet??
The point here is, though, that even to hear this coming out of a POTUS mouth towards an ally, a sovereign state should automatically make even supporters want to tear a strip off the POS.