>>508449815https://www.youtube.com/watch?v=a7f0ESMofbI
There's an episode of Kino no Tabi where two nations were destroying each other fighting a war. They correctly realized that it was not sustainable, but their solution to the problem was to, in coordination with each other, invade a 3rd country that was basically defenseless like a game, comparing the number of casualties they inflicted in order to "win".