For most of human history, military power has been tied to economic power and population size: Those with larger economies and populations have been more powerful. AFAIK, that is why the United States has been the dominant military power since WWII and why China may challenge the U.S. It's also how national governments have maintaind sovereignty, by having far more economic and human resources than any internal competitors (and when that isn't true, such as in poor countries, national governments can be ineffective).
But what if military power depends on the quantity and quality of bots? What stops a smaller or even poorer country from building a robot army? Poor countries have more manufacturing capacity than wealthy ones, AFIAK, and perhaps they need only one innovative, disruputive software developer to make their bot army superior or at least competitive. For example, could tiny Singapore dominate SE Asia or even become a world power? In fact, what stops a sub-national group such as Hezbollah, a Mexican drug cartel, another organized crime group, or even a wealthy individual from building their own army? Without checking the inside of every factory on the planet, will we even know the robot army is being built until it's too late? Will governments be able to protect their citizens from warlords and exercise sovereignty over their own territory? What about poor governments?
It's very speculative -- it remains to be seen, for example, how effective autonomous weapons will be -- but it could be a historic change. Perhaps our hope is that the technology will turn out to be like other weapons, such as airplanes: Anyone can build one, but the single engine prop plane is no threat to what can be built with the Pentagon budget.