I think you're overstating the nature of the international communities actions towards Sudan. Economic sanctions haven't been suggested. Nobody is asking China to stop buying Sudanese oil, nobody is asking Russia to back away from the oil development projects it is being offered, as everyone knows that the effects of sanctions bypasses the rulers and can be devastating to the population.

The other side of the imperialist coin is that in order to be recognized as a member of the international system, it is reasonable to expect that you don't commit mass atrocities on your own citizens because you want the oil beneath the ground they live on.

We are a long, long way from "imperialism" here.

"It Can't Be Just About Us"
--Frank Schnittger, ETian Extraordinaire