I was reading about this the other day. The Iranians need to be dealt with before they acquire these, if they haven't already.
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.