Iran's top nuclear negotiator, Hossein Mousavian, expressed frustration on Wednesday that European countries had not delivered on incentives promised last year in return for Iran's pledge to suspend nuclear enrichment.

"We have not yet seen considerable progress in our co-operation and no incentives in political, security, technological, economic and nuclear fields," Mr Mousavian, secretary of the foreign policy committee of the Supreme National Security Council, told the Financial Times. "Now it is time to deliver something to Iranian public opinion and nation."