Wipe out one Israeli city, and a whole bunch of Iranian cities.
dont forget the destruction of Mecca, the Aswan high dam, as well as atomic detonations at strategic points into the country of Israel to stave of invading forces. I would also blast an area in the desert region on the Egyptian border as well. Tehran with 2H’s, Reactor sites at Bushehr, Arak, a strike on the purification sites at strategic locations associated near water at Gchine, Chalus, Neka, Tabriz, Lavizan, and Gorgan. Follow up with atomic detonations at every major port which supports military vessels. You have to go all in if you are attacked.