Refusing to cooperate with Democrats is what sank him.
He needed support from Democrats to keep the Speakership. He’s spent the entire year giving them no reason to trust him – including going on the Sunday shows this week knowing this vote was coming and trying to blame Democrats for the near shutdown.
The wider international community has largely rejected wars of conquest as legitimate in modern times.
The exact same argument could be applied to Israel and e.g. the Golan Heights, but I don’t think you’ll find that to be a particularly popular position.