US-Iran MoU likely to be signed next week, sources tell CBS; Iran would halt uranium enrichment for 15-20 years under the proposal, First steps include ensuring "freedom of trade" by demining and opening the Strait of Hormuz

MoU signing would kick off 60 days of talks to negotiate details of a U.S.-Iran agreement. That time period could be extended as needed, according to multiple sources. In principle, Iran would commit to a lockout of 15-20 years during which it would not enrich uranium and would dismantle its nuclear sites.  In exchange for taking these steps, Iran would receive financial relief staggered over time and sequenced to correspond with compliance.