Drum doesn't get it:
I don't quite get what the sanctions crowd is after. We have no diplomatic relations with Iran. Trade is embargoed and imports are prohibited. (Except for Persian rugs!) We sanction foreign companies who do business with Iran. Investment in Iran is prohibited. The Treasury Departments forbids banks from processing even indirect financial transactions with Iran. There's a little more we could do, but not much.
He doesn't think Chinese and Russian sanctions are forthcoming, which is the general consensus.