Those cases are refreshingly black and white. Yes and yes. You deliver an ultimatum, wait for the invader to withdraw. If they call your bluff, you level them.

Those cases are refreshingly black and white. Yes and yes. You deliver an ultimatum, wait for the invader to withdraw. If they call your bluff, you level them. Just a city at a time if they don't have nukes. Wholly if they do. I mean if your going to rely on a nuclear self defense, when someone attacks you, you have to be willing to use it.