Putin has said he would provide Iran with defensive missiles. It's not clear whether this would be included, and also it's not clear what Putin now intends to do. But I agree we either need to act beforehand, or we need to find a defense for this threat, if possible.
It makes me think of the Falklands.
As I recall the Soviet Backfire bomber was specifically designed to attack US carrier battle groups. I believe, if a war goes nuclear, it will go nuclear at sea first in an attempt to get our carriers. However, one does not want to pi$$ off a carrier battle group.
You cannot be sure whether Iran has got these missiles yet.Their Kilo class subs well need to have their torpedo tubes modified to carry these missiles.That's not very simple for the Iranians to do.