Iran has no interest in nuclear weapons but will keep pursuing peaceful nuclear energy, Iranian Supreme Leader Ayatollah Ali Khamenei told heads of state from developing countries in Tehran.

Iran, hosting a summit of the 120-nation Non-Aligned Movement (NAM), is hoping the high-profile event will prove that Western efforts to isolate it and punish it economically for its disputed nuclear program have failed, international media report.

"Our motto is nuclear energy for all and nuclear weapons for none," Khamenei told the assembled heads of state.

United Nations Secretary General Ban Ki-moon, attending the Tehran summit, urged Khamenei late on Wednesday to take concrete steps to prove Iran's nuclear work is peaceful.

The West suspects Iran is seeking a nuclear weapons capability, an accusation Tehran denies.

In his speech, Khamenei criticized the U.N. Security Council as an illogical, unjust and defunct relic of the past used by the United States "to impose its bullying manner on the world".

"They (Americans) talk of human rights when what they mean is Western interests. They talk of democracy when what they have is military intervention in other countries," he added.

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