I'm having this issue on console as well, no idea how to upload my save from that. But its simple to replicate. As soon as I made a kingdom two factions one whom I've had high relations with almost all of their vassals and king, declared war on me and there's nothing I can do about it, I've tried fighting them off with my own vassals, but it's not showing any results. Tried executing and even that hasn't shown favorable results. Now I even have sturgians declared war and Its completely crippling their peace demands would put me in ruins with how high they are! All my villages are or have been raided by them I can hardly keep any military!