Mmm yeah imma small brain here and say it cannot be won. There are nukes on subs traveling all over the ocean. Not to mention that the environmental damage and radiation will probably fuck up the world really bad no matter what. Did you know a single nuke in orbit would emp a whole continent and destabilize climate? Great, now you do
My question is "what does this mean for the nature of empires?" — can they no longer truly fall once they enter the nuclear era? How does civil war look?