"Iran will not be fooled by the superficial conciliatory tone of the United States," said Khamenei in a speech to students on the eve of the 30th anniversary of the seizure of US embassy in Tehran by Islamist students.

"This new American president (Barack Obama) repeatedly sent us oral and written messages to come and change the page... to come and cooperate in solving the problems of the world. We said we will not pre-judge. We will see their action and see what they do about the change," Khamenei said.

"But in the past eight months what we have seen is contradictory to what they say. They are telling us to negotiate, but alongside the negotiation there is a threat that if the negotiation does not bear the desired results, then we will do this and we will do that," he said.

"We do not want any negotiation, the result of which is pre-determined by the United States," he added.

Iran is currently engaged in US-backed talks with world powers over how to procure nuclear fuel for a Tehran research reactor.

World powers are backing the deal, but Iranian officials are increasingly opposing it.

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