If they get a nuke, and they will, unless we put a stop to it, they will nuke Israel. Or try to. If they fail, Israel may nuke them. More likely, Israel and the US (and perhaps Britain) will simply destroy their military and energy generation/transmission facilities with conventional weapons, then tell the rest of the world "we told you so" and "do what you want with them." Except, giving them weapons. Which we will just destroy, again.