"Tehran cannot force Washington to give up its regional agenda. Washington cannot strip Tehran of its power to impose costs without running the risk of a wider war," writes Sanam Vakil.

Trump and Iran might keep talking. Or they might keep bombing. Or both.

Donald Trump's Iran strategy is unravelling.

"Tehran cannot force Washington to give up its regional agenda. Washington cannot strip Tehran of its power to impose costs without running the risk of a wider war," writes Sanam…

Both sides face pressure points that could make a protracted war painful.