Robot wars, or drone strikes, have been going on for at least 20 years perhaps more. And perhaps robots have the ability to even the battlefield. Imagine China sending billions of drones to counteract American drones. Perhaps we should be looking forward to drone war, because anyone can destroy your machines, it's not a big deal for anyone to enter such a war. There will be no diplomatic incident over destroyed robots as a provocation to all out war between countries with real power. The battlefield is pretty much open to anyone with the hardware.