(Please allow this light-hearted deviation which might be considered in poor taste)
Or we could build giant dueling death robots who decide wars 1-on-1 instead of pointlessly wasting human lives like in classic Sci-Fi schlock Robot Jox [0]:
> Fifty years after a nuclear holocaust, mankind is decimated and the surviving nations—the American western-influenced Market and the Soviet-Russian-influenced Confederation—have agreed to outlaw traditional open war. In their place, disputes are settled with gladiator-style matches between giant robots operated by pilots called "robot jox" [...]