If President Obama decides to get a nuclear deal with Iran ratified by the UN Security Council rather than the United States Senate, I'd laugh a lot if Russia vetoed the deal, worried that we would use the resolution to attack Iran.
Remember, Russia did not use their veto and let a UNSC resolution pass on Libya that authorized a pointless no-fly zone--which President Obama promptly twisted into an air campaign in support of rebels who overthrew and killed Khadaffi.
What if Russia is so worried about being fooled again that they veto such an Iran deal authorization just in case?
Like the expression goes, I know they're paranoid. But are they paranoid enough?