Hoo boy would this ever complicate things. Iran with nukes is one of the last things we need. Although there had been rumors for awhile that Iran was on the cusp of getting a nuke. They could be bluffing though just to keep Israel guessing as to what they’ve got.
MAD works! It would complicate aggression in the area. It will come down to a two state solution or millions of Israelis and Arabs or Persians will eventually die.