There are no "rules" on the international stage. There is no way to impose any rules on a sovereign state. As such, what you perceive as "rules" are merely the

There are no "rules" on the international stage. There is no way to impose any rules on a sovereign state. As such, what you perceive as "rules" are merely the lowest energy states that will change when the sovereign state decides that it doesn't want to abide by them anymore, and there's not a single thing anyone can do about that short of imposing sanctions or declaring a war. "International law" is a fictional construct, since there can't be any enforcement.