Comments come as bloc's talks coordinator heads to Tehran; Iranian top diplomat says removal of IRGC from US terror list remains a 'key demand'

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

European Union coordinator for negotiations in Vienna says participants going home for consultations; France says talks 'difficult' but some signs they could succeed

Enrique Mora says all sides showing 'a clear will to work toward the successful end of this negotiation'; Tehran demands access to oil revenue

Enrique Mora, chair of the Vienna talks, says it is 'important to pick up the pace' of the negotiations and 'move forward'

Iranian source tells state media country formally notified Britain, France, and Germany it is willing to meet with reps on their turf or in Tehran, but so far has had no response

Bloc says its diplomatic service is 'sparing no efforts' to restart Vienna negotiations with all parties to 2015 nuclear pact

Iranian Foreign Ministry says visiting European Union envoy Enrique Mora told officials that his bloc is 'ready to collaborate with Iran and the other parties'

Ali Bagheri said meeting with EU's Enrique Mora would include discussion of lifting 'cruel sanctions' imposed after US pulled out of 2015 pact

Iranian Foreign Ministry says Enrique Mora's visit is to follow up on matters of shared interest, particularly Iran-EU relations, Afghanistan and the 2015 nuclear agreement