Iran's acceleration of its enrichment of uranium to near weapons-grade breaches restrictions imposed in a 2015 nuclear deal, Germany said on Wednesday, urging Tehran to return to negotiations with a constructive approach.
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"Iran has no plausible civilian justification for these steps, and instead gains military knowledge and skills," a Foreign Ministry spokesman told a news conference. "We urge Iran to return to the negotiating table with a constructive stance."
On Tuesday, Reuters quoted an IAEA report that Iran has accelerated its enrichment of uranium to near weapons-grade, a move raising tensions with the West as both sides seek to resume talks on reviving Tehran's nuclear deal.
Iran increased the purity to which it is refining uranium to 60% fissile purity from 20% in April in response to an explosion and power cut at its Natanz site that damaged output at the main underground enrichment plant there.
Iran has blamed the attack on Israel. Weapons-grade is around 90% purity.
In May, the International Atomic Energy Agency reported that Iran was using one cascade, or cluster, of advanced centrifuges to enrich to up to 60% at its above-ground pilot enrichment plant at Natanz. The IAEA informed member states on Tuesday that Iran was now using a second cascade for that purpose, too.
The move is the latest of many by Iran breaching the restrictions imposed by the 2015 nuclear deal, which capped the purity to which Tehran can refine uranium at 3.67%. The United States and its European allies have warned such moves threaten talks on reviving the deal, which are currently suspended.
Following Reuters' report, Iran reiterated that its nuclear program is peaceful and said it had informed the IAEA about its enrichment activities. It added that its moves away from the 2015 deal would be reversed if the United States returned to the accord and lifted sanctions, Iranian state media reported.
"If the other parties return to their obligations under the nuclear accord and Washington fully and verifiably lifts its unilateral and illegal sanctions ... all of Iran's mitigation and countermeasures will be reversible," Iranian Foreign Ministry spokesman Saeed Khatibzadeh was quoted as saying by state media.
The IAEA said on Monday that Iran had made progress in its work on enriched uranium metal despite objections by Western powers that there is no credible civilian use for such work.
Uranium metal can be used to make the core of a nuclear bomb, but Iran insists its aims are peaceful and it is developing reactor fuel.
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