UN nuclear referral 'not constructive'

Iran's case was referred back to the council after Tehran failed to respond to a set of proposals backed by six world powers, which called for Tehran to halt uranium enrichment in return for economic and diplomatic incentives.

Tehran publicly insists it wants to talk but has refused to give up enrichment. Western diplomats said Iran's top nuclear negotiator gave no sign he was interested in negotiating when he met the European Union foreign policy chief on Tuesday.