Iran's chief nuclear negotiator has called for a global nuclear weapons ban and accused rich countries of seeking to "monopolise" atomic energy.
Visiting Tokyo to meet senior Japanese officials, Saeed Jalili said: "The crime that was committed in Hiroshima must never be repeated.
"A global determination must be made to disarm all nations with these weapons."
Mr Jalili reiterated that his country's nuclear technology was for civilian purposes.
US President Barack Obama's administration has given a rough deadline of the end of the year for Iran to allay Washington's concern about its atomic programme.
The US is pressing Tehran to accept a UN-brokered plan under which Iran would ship the majority of its low-enriched uranium out of the country.
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