The West wants sanctions relief to remain limited and easily reversible in the early years of the deal, to make sure Iran doesn't start breaking the rules. The Iranians say they can't accept that, because without large-scale and permanent sanctions relief they can't entice foreign business to help revive Iran's ailing economy — which they consider the whole aim of the deal.

U.S. diplomats study how to preserve Iran's dignity in nuclear talks - latimes.com Tuesday, February 18, 2014 @ 9:33pm