The Iranian effort to achieve nuclear capability is a strategic goal. Their sense is that with nuclear - weapons they will be able to deter the U.S. , intimidate and control the other powers of the Gulf. They believe attaining nuclear capability is vital towards their achieving the leadership of the Islamic world. Any negotiation for them will be a means of delaying action to impede their nuclear program. The rest is 'wishful thinking'.
from the article: The best option