Top EU diplomat Josep Borrell said on Saturday Iran and world powers were “very close” to agreement on reviving their 2015 nuclear deal, which would curb Tehran’s nuclear programme in exchange for lifting tough sanctions. Then-US President Donald Trump abandoned the pact in 2018, prompting Tehran to start violating its nuclear limits about a year later, and 11 months of on-and-off talks to revive it paused in Vienna earlier this month after Russia presented a new obstacle. Russia later said it had received written guarantees that it would be able to carry out its work as a party to the deal, s…