It's really a monumental job that we have to keep all these nations under some kind of semblance of control and compliance; but, then again, someone has to do it and we are the best qualified for the job. That's why we have established the set rules that we expect the rest of the world to follow.
But wait, is that not a contradiction? Isn't that a double standard, defined as "when something is deemed acceptable for use by one group of people, but is considered unacceptable for use by any other group?" Yep, that is exactly true. And in the case of America that has now become the rule as we currently occupy a position in the world that no other nation can match or even challenge -- at least militarily. So, therefore, we set down the rules and the rest of the world must follow them.
Here are some examples of what other nations might try to do, but according to the rules we have set it could not be justified, and their actions would have to be condemned:
*China invades and occupies Taiwan.
*Russia invades and occupies Georgia or Turkmenistan.