Please explain the application of nuclear weapons for defensive purposes, I have never heard of such a thing!
Are they putting their nukes onto superfast superaccurate space-missiles so they can use them to shoot down incoming enemy ICBM's from secret stealth satellites in low orbit?
Or is it a ground-based nuclear-fusion laser of some sort?
I never understood this logic, so I can't help you. But this was the official explanation given by the NATO, when they provided the nukes to Israel. So I assume, they will do the same when the nukes are delivered to Saudi Arabia as well. Perhaps the thinking is that the possession of nuclear weapons will act as a deterrent preventing future attacks.