“We have seen very concerning developments on the nuclear side as well as new rounds of US sanctions,” Borrell wrote to EU international ministers in a letter seen by AFP on Tuesday.
“That risks undermining diplomatic efforts, including ours, to facilitate a US return to the JCPOA and to bring back Iran to the full implementation of its JCPOA commitments,” mentioned the letter despatched forward of a gathering of the highest diplomats on Monday.
The JCPOA, or Joint Comprehensive Plan of Action, is the instrument agreed to implement the 2015 accord.
The EU and different signatories to the pact are pushing to get US President-elect Joe Biden to return to the settlement after scrambling to maintain it alive following Donald Trump‘s withdrawal over two years in the past.
But they face a battle to get Iran and the US again on the identical web page after Trump reimposed harsh sanctions and Tehran responded by breaching limits set by the deal.
The Iranian authorities has signalled a readiness to interact with Biden, who takes workplace on January 20 and has himself expressed willingness to return to diplomacy with Tehran.
But supreme chief Ayatollah Ali Khamenei has insisted the US should begin out by lifting its sanctions on Tehran.
That could possibly be a tricky promote as Iran has set about pushing again in opposition to the constraints within the deal that sought to curb its nuclear programme in return for reduction from the punitive measures.
Signatories Britain, France and Germany on Saturday known as on Iran to halt plans to supply uranium metallic, after Tehran advised the UN’s nuclear watchdog it was advancing analysis on the difficulty.
That transfer got here after Iran introduced earlier in January that it had began the method of enriching uranium to twenty %.
That represents its largest break but from its commitments beneath the 2015 nuclear deal struck with world powers.