US President Joe Biden said Friday it was too early to know whether indirect talks underway with Iran would succeed in reviving a nuclear accord.

Biden said the United States does "not think that it's at all helpful" that Iran this week ramped up uranium enrichment, a move taken in response to sabotage on a nuclear facility believed to have been carried out by Israel.

"We are nonetheless pleased that Iran has continued to agree to engage in discussions," Biden said at a joint news conference with Japanese Prime Minister Yoshihide Suga.

"I think it's premature to make a judgment as to what the outcome will be, but I think we're still talking," Biden said.

He reiterated that he supported the 2015 agreement negotiated when he was vice president but would not make "major concessions" to return to it.

Former president Donald Trump trashed the agreement -- under which Iran was promised sanctions relief in return for major curbs on its nuclear program -- and instead imposed sweeping economic punishment including a unilateral ban on other nations buying its oil.

Iran wants the United States to lift sanctions before it rolls back the measures it took in protest which led the country away from compliance.

The State Department said Friday that the US delegation would remain in Vienna, where it is holding indirect talks with Iran through European intermediaries.

Iran nuclear talks set to resume in Vienna
Vienna (AFP) April 17, 2021 - Talks on Iran's nuclear programme aimed at salvaging a 2015 nuclear deal were set to resume Saturday, a day after Tehran said it had started producing uranium at 60 percent purity.

The Islamic republic had declared it would sharply ramp up its enrichment of uranium earlier this week, after an attack on its Natanz nuclear facility that it blamed on arch-foe Israel.

The incidents cast a shadow over talks in Vienna aimed at rescuing the nuclear agreement between Iran and world powers that then US president Donald Trump abandoned almost three years ago.

The European Union said Saturday's talks would involve EU officials and representatives from Britain, China, France, Germany, Russia and Iran.

The talks are aimed at determining which sanctions the United States should lift and the measures Iran has to take to come into compliance with the accord.

The Russian ambassador to Vienna, Mikhail Ulyanov, spoke of "slow but steady progress in the negotiations on restoration of the nuclear deal" on Twitter.

Ali Akbar Salehi, head of the Atomic Energy Organization of Iran, confirmed Iran was now producing uranium enriched to 60 percent purity, taking the country closer to the 90 percent level required for use in a nuclear weapon.

"The enrichment of uranium to 60 percent is underway" in Natanz, he said, quoted by Tasnim news agency.

Iran has repeatedly insisted it is not seeking an atomic bomb, but at that rate of production, it could take the Islamic republic 322 days to produce the amount of 60 percent enriched uranium needed to make one bomb, based on the International Atomic Energy Agency's (IAEA) criteria.

But this would require Iran to have a sufficient amount of 20 percent enriched uranium, which it does not have, according to the latest IAEA data.

Tehran has gradually rolled back its nuclear commitments since 2019, a year after Washington withdrew from the accord and began imposing sanctions.

The 2015 deal, known formally as the Joint Comprehensive Plan of Action (JCPOA), gave Iran relief from sanctions in return for curbs on its nuclear programme.

Under the accord, Iran had committed to keep enrichment to 3.67 percent, though it had stepped this up to 20 percent in January.

Negotiations aimed at ensuring the return of the United States to the JCPOA and the lifting of sanctions resumed this week in Vienna.

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Iran says 60% enrichment response to Israel's 'nuclear terrorism'
Tehran (AFP) April 14, 2021
Iran's President Hassan Rouhani said Wednesday the decision to boost uranium enrichment to 60 percent was a response to arch-foe Israel's "nuclear terrorism" against its Natanz facility. Tehran starting up advanced centrifuges and producing more highly refined uranium "is a response to your malice", Rouhani said in a message aimed at the Jewish state. "What you did was nuclear terrorism," he said, referring to a blast early Sunday that knocked out electricity at its main nuclear facility in cent ... read more