We have been in a defensive stance of Israel, but that hasn’t stopped Iran from working towards the goal they tout. The main problem is, Israel is a small enough nation that Iran would realistically only need a couple nukes, or a few a most, to destroy the entire country. I’m not confident that they wouldn’t take the risk, if they achieve the capability

As far as the Iran deal, I don’t believe it ever stopped them from working on it. I have no concrete proof to back it up, other than the Iran only agreeing to the deal if it required them to be given at least 30 days notice before a “surprise inspection” was conducted. That would only be a sticking point if they were trying to hide something, in my eyes