Iran has maintained that its controversial uranium enrichment work is non-negotiable.
Iranian government spokesman, Gholam Hossein Elham, said that nuclear fuel technology was the Islamic republic's 'absolute right' but said Iran was willing to 'negotiate on common international concerns'.
Tehran has said it is entitled to uranium enrichment under the Nuclear Non-Proliferation Treaty, but the US says Iran is attempting to develop atomic weapons.
Iran has long insisted that its nuclear programme is peaceful.
Nuclear negotiator Ali Larijani said his country would not accept any 'threats or preconditions' in negotiations.
An international proposal has offered incentives and multilateral negotiations in return for the suspension of enrichment.
The UN's nuclear watchdog, the IAEA, meets in Vienna later today to discuss Iran's response to the offer.
In February the IAEA found Iran to be in violation of non-proliferation safeguards. This opened the door to possible punitive action by the United Nations Security Council.
US President George W Bush has said that Tehran has 'weeks and not months' to accept the international community's offer and warned that the UNSC would act if Iran did not comply.
