According to DebkaFile the negotiations in Geneva are facing four stumbling blocks:
1) Iran will not shut down its underground enrichment plant at Fordo.
2) Work on building the Arak heavy water reactor will not be halted.
3) Iran will not allow the export of a single gram of its enriched uranium from the country.
4) Iran will not sign the Additional Protocol of the Non-Proliferation Treaty which expands international supervision of its nuclear program and permits snap inspections.
As I see it Iran is right in this in most of the points:
- this is about an interim agreement that should cover only six months. So asking Iran to do near irreversible things like signing the Additional Protocol shows bad faith.
- the same applies to forcing Iran to export enriched uranium. Iran uses that uranium in an experimental reactor to produce medical isotopes. Given time it would slowly consume its stock. Asking it to export it is a public statement that you don't trust Iran to keep its word. As such the demand is deliberate insult meant to sabotage the talks.
- Iran claims that the Arak reactor is just a replacement for another reactor to produce medical isotopes. Others claim its main purpose is to produce plutonium. That is a discussion that needs further exploration. So while it is fair to ask Iran to stop further construction, it should be done in such a way that if it would be decided later on to resume construction that can be done without much extra costs.
- the agreement is about stabilizing the expansion of Iran's nuclear abilities, not about abolishing them. The latter should be discussed for the definitive agreement. So rather than just shutting down Fordo the agreement should specify that Fordo should not be expanded or upgraded and should specify the amount of enriched uranium Iran is allowed to have. And Fordo should only be allowed to produce more when the stock falls below that limit.