Al Jazeera reporter: The exchange of messages continues through the Qatari mediator and an Iranian team present in Doha. Time is of the essence and the dispute lies in each side's priorities. Iran wants seven conditions to be implemented within two days followed by negotiations, while Washington wants access to nuclear facilities before any action. The optimism remains, but no one rules out a return to the conflict.

Al Jazeera reporter: The exchange of messages continues through the Qatari mediator and an Iranian team present in Doha. Time is of the essence and the dispute lies in each side's priorities. Iran wants seven conditions to be implemented within two days followed by negotiations, while Washington wants access to nuclear facilities before any action. The optimism remains, but no one rules out a return to the conflict.