Rubio asserts Iran must 'walk away' from uranium enrichment

Rubio highlights key rifts in US-Iran nuclear talks as Trump threatens military action if no deal is reached

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Iran has to 'walk away' from uranium enrichment and long-range missile development and it should allow Americans to inspect its facilities, US Secretary of State Marco Rubio said on Thursday as a round of nuclear talks was postponed.

Rubio's comments underscore the major remaining divisions in talks between the countries to resolve the long-running dispute over Iran's nuclear programme, with US President Donald Trump threatening to bomb Iran if there is no agreement.

"They have to walk away from sponsoring terrorists, they have to walk away from helping the Houthis (in Yemen), they have to walk away from building long-range missiles that have no purpose to exist other than having nuclear weapons, and they have to walk away from enrichment," Rubio said in an interview on the Hannity programme on Fox News. Iran has repeatedly said it will not give up its missile programme or its uranium enrichment - a process used to make fuel for nuclear power plants but which can also yield material for an atomic warhead.

On Thursday a senior Iranian official told Reuters that the scheduled fourth round of talks due to take place in Rome on Saturday had been postponed and that a new date would be set "depending on the US approach".

Rubio said Iran should import enriched uranium for its nuclear power programme rather than enriching it to any level.

"If you have the ability to enrich at 3.67% it only takes a few weeks to get to 20% then 60% and then the 80 and 90% that you need for a weapon," he said.

Iran has said it has a right to enrich uranium under the terms of the nuclear Non-Proliferation Treaty. It denies wanting to build a nuclear bomb.

Rubio also said Iran would have to accept that Americans could be involved in any inspection regime and that inspectors would require access to all facilities, including military ones.

Washington is ramping up pressure on Iran. US President Donald Trump on Thursday said all purchases of Iranian oil or petrochemical products must stop and that any country or person buying any from the country would be immediately subject to secondary sanctions.

Iran spoke out against that approach on Friday. "While stressing its commitment to the path of diplomacy and declaring its readiness to continue negotiations, Iran will not tolerate approaches based on threats and pressure," the Foreign Ministry said.