Gypsy: When I said coup/ takeover I was not saying that the US would take over. What I meant is tehy look up to the support of US incase something goes wrong within their country either due to insurgence or external forces.
Abu: I agree with you on people being harmed. But isn't it more the responsibility of the govt of the particular nation (in this case,US)to protect their people than some one who would impose such a sanction.

Any ways its a very hypothetical situation since the scenario of an Arab Unity and the chances of imposing such a sanction are too improbable!

Somebody told me, "You are what you eat".Now I know why I'm nuts!!