Hmm, how bout this, Smaller Nations can always declare on Larger nations. Could causes Larger Nations to always be on there toes as the largest Nation in CN could be declared on by anybody in the game. Though keep the strength range for the larger nations so there is no bullying. Though if I'm a larger nation, and i'm friendly that is a smaller nation that's under attack, I will want to help the smaller nation. Right now, I can only send Aid to them via money, solders, and tech. I wonder if there could be a way to help out the smaller country out more without it getting abused.
I'm just spit balling here.