I am perplexed by Rubio and Witkoff's push for zero enrichment. It is a non-starter that will close the window of opportunity that currently exists with few prospects of reopening it.
Even if this is a negotiating strategy and the real red line is different, then that should be handled at the negotiating table rather than in public. Negotiating in public is not conducive to success.
Iran has never agreed to completely end enrichment, even temporarily. They know that restarting the enrichment will be extremely costly politically, even if the agreement is broken by the US. This would amount to them giving up their main leverage in return for a promise of a reward down the road.
Not only are they starting with zero trust in the US, they also saw what happened to Hamas. Netanyahu broke the ceasefire agreement after Phase I and faced no consequences from the US for sabotaging Phase II and III. The release of the American hostages was reportedly made in return for promises by the US to press Netanyahu for a ceasefire afterward, but that does not seem to be happening. Instead, Netanyahu is launching a major ground offensive into Gaza.
So the idea that the Iranians would give up their main leverage in the hope that there will be reciprocity down the road assumes a degree of Iranian trust and confidence in the US that frankly has not existed for the past 45 years. Promises of primary sanctions relief do not sufficiently change that picture.
Bottom line - the zero enrichment goal was Bolton and Pompeo's objective precisely because they knew it would lead to war. That remains true today.
Source: Trita Parsi