DUBAI - Iran's chief nuclear negotiator Saeed Jalili warned world major powers on Thursday against adopting "unconstructive measures" that harm negotiations over Tehran's disputed nuclear program, state television reported.

In a letter to European Union foreign policy chief Catherine Ashton, Jalili said "continuing successful talks is only possible when it is in the framework of cooperation", according to state television.

Iran has been in a decade-long dispute with western countries over its nuclear program which they fear is aimed at making nuclear weapons, a charge Tehran denies.

The Islamic state held an "intense" round of talks with six world powers about its nuclear program in Moscow earlier this month, but talks failed to bring about any breakthrough.

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