Iran said today it would not abandon its work on uranium enrichment, which the UN has demanded it halt, and was prepared to face the consequences.
"Iran's uranium enrichment and nuclear research and development activities are irreversible," Foreign Ministry spokesman Hamid Reza Asefi told a weekly news conference.
Western nations have threatened to press for international sanctions on Iran if it does not heed calls to stop enrichment. The US has said it wants a diplomatic resolution to the stand-off but has not ruled out military action.
The UN nuclear watchdog, the International Atomic Energy Agency (IAEA), is due to report by an April 28th deadline on whether Iran is complying with a UN demand that it halt enrichment, a process Western nations fear could be used to develop atomic weapons.
Iran announced this month that it had enriched uranium for the first time to a level used in power stations but insists its nuclear programme is purely civilian.
"If the (IAEA) report contains expert assessment, there will be nothing left to worry about," Mr Asefi said.
"However, if the report comes out and somehow puts pressure on Iran or speaks with a language of threats, naturally Iran will not abandon its rights and it is prepared for all possible situations and has planned for them," he said.
Iran has further stoked worries in the West by saying it is pressing ahead with research and development on advanced P-2 centrifuges, which can enrich uranium faster than its existing P-1 units.
"So far, we have never used P-2 centrifuges, and what we have used is P-1 machines. We have informed the agency (IAEA) about that," Mr Asefi said.
He also said Iran was still discussing a Russian plan to enrich uranium on Russian soil. Iran said in February it had a "basic agreement" on joint enrichment but talks appeared to stall after that because of Iran's refusal to scrap home-grown enrichment.
"The Russian plan is still on the table but the ground for its implementation should be prepared," Mr Asefi said. "Russia's plan and other plans that will preserve our rights can be assessed."