Foreign minister doesn't elaborate on what those issues are but says two other 'red lines' nearly resolved, as Vienna talks appear to be reaching close

Development enables resumption of talks that were stalled after Moscow demanded assurances sanctions over Ukraine won't impact its ties with Tehran

Sources cited by Bloomberg say Jerusalem and Abu Dhabi are separately lobbying Washington to establish regional defense plan in case new nuclear deal is signed with Tehran

Hossein Amir-Abdollahian to depart Tuesday as negotiations on revised accord stall over Kremlin's insistence that Ukraine sanctions not hinder its trade with Tehran

In English and Hebrew video messages, former PM claims world powers are close to signing 'a nuclear agreement that will give the ayatollahs a nuclear arsenal'

Halt comes after Riyadh put 81 people to death over various crimes, in largest known public killing in kingdom's modern history, with over three dozen said to be Shiites

Josep Borrell says he will continue to be in touch with all parties 'to overcome the current situation,' as Russia's Ukraine invasion complicates final stages of diplomacy

Iranian top diplomat accuses US of making new demands for nuclear talks and complicating negotiations in Vienna

Raisi appears to defend Vienna negotiations while country's top diplomat and a security official points finger at US for deadlock, saying Washington making unreasonable proposals

Ali Bagheri Kani arrives in Austrian capital following sudden trip back to Tehran, with EU envoy indicating new agreement awaiting Islamic Republic's okay