A dialogue:
Iran: Fine, we will do the bare minimum to get the sanctions released.
USA: Thanks. Victory!
Iran: Shortly after that, the money will start flowing, and we will have an enormous influx of investment from nations like China and Russia, who have a completely different geopolitical endgame than the USA, amd frankly would love to see the USA humiliated.
USA: That’s weird. I thought we could totally trust them. In any event, we look forward to you doing the bare minimum in the short-term, and Congratulations on getting crazy rich super fast. Don’t spend any of that new money or non-nuclear arms we let you have on terror elements, say, in Syria, cool?
(a few years elapse)
USA: Hey, you aren’t getting the things done we agreed to fast enough and transparency is lacking. What gives?
Iran: Dismantling reactors and facilities and the like turned out to be harder tjan expected. Just delays. Nothing to get upset about.
(a few years later, but not yet even to the 10 year mark)
USA: Hey, you’re seriously not doing the things you agreed to.
Iran: It is slower and more expensive than expected. You get it.
USA: No. We agreed you would do this stuff, and you haven’t. Add up all the incremental things you haven’t done and this is “significant”.
Iran: No way. “Significant” meant building a nuclear weapon. That is what the parties intended. That’s what the “snap back” penalty is designed for. It’s a last resort punishment for the ultimate crime. We aren’t buildinga nuclear weapon, we just aren’t on the old timeline any more because of practical issues. You get it.
USA: We disagree - non-compliance can be “significant” and we may reconstitute sanctions!
Iran: Good luck convincing anyone else of that. That ain’t what the agreement says. Also, you sure you want to piss us off? Aren’t you relying on us in Iraq and other places?
USA: We are relying on you. But we expected you to honor the things you promised to do.
Iran: Can’t talk right now. Gotta go cash this new check for a gazillion dollars from China. Did you hear we might get the Olympics?
USA: I don’t think you heard us. We think that even though you aren’t building a nuclear weapon, you are in material breach of the agreement and we are about to reconstitute sanctions!
Iran: And? The agreement has a poison pill in it. We’re in material breach, you say? Fine. That means we dont have to comply with any of it. You go ahead and reinstitute sanctions, and we will start building a nuclear bomb the next day. Oh, and who gives a crap about your sanctions at this point? We’re rich, amd China and Russia aren’t going anywhere. So, USA, “snap back” until you’re blue in the face. We’ll have more than enough money without you, and a nuclear weapon, which is exactly where we wanted to be, but first we had to trick you into releasing sanctions, which we did, and the only real cost was time, which we have plenty of. This deal has been sweet.
USA: But we will reinstitute sanctions!
Iran: We’ve already addressed that. See you at the Olympics.