Iran says it wo n't send partially enriched uranium abroad for medical research . Proposal was key part of deal brokered by U.N. nuclear watchdog . Comment:
Iran says it wo n't send partially enriched uranium abroad for medical research . Proposal was key part of deal brokered by U.N. nuclear watchdog . U.S. says proposal `` was accepted in principle by all parties including Iran '' U.S. , EU nations concerned Iran intends to develop nuclear weapons .