> Not necessarily kill, just stop further AI development.

But then this would be considered an act of war, so then the killing starts.

That's not how nuclear arms control works, in most cases. Saying it's how superintelligence would work is a strong assertion. Especially since a true aligned superintelligence would make it much easier to finesse/manipulate the situation in your favor in nonviolent ways.

Not saying I think countries should be trying to win, but I don't think this win condition is impossible.