I don't understand what you mean.. ?
What I mean is that 'Mutually' Assured Destruction is kind of contingent on the belligerents being known to each other. If, instead of a nuclear payload being delivered by aircraft or missile, it was somehow smuggled into Israel and then set off on the ground, then that would potentially negate the negative consequences for whoever carried out the operation.
This is what I was meaning when I responded to SOTTREADER's comments about Iran not being crazy enough to attack Israel.