OT: I'll make this my last OT comment with apologies to all. To answer your question the way you would prevent it is by forcing them to accept terms of surrender as their economy collapses due to a lack of fuel, to start. Iran is a net importer of gasoline. In an "all out" conflict there would, of course, be a spike in oil prices...but the long term result would be the humiliation of the recalcitrant mullahs of Tehran as well as the possible overthrow of their regime. I'd pay more for gas for the mid-term in order to remove the threat from a militant and theocratic Persia.
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