Iran insisted Thursday that a revived nuclear agreement with major powers remains achievable despite a negative US assessment of two-way talks in Qatar intended to reboot the stalled negotiations. The US State Department said the EU-brokered proximity talks in the Qatari capital Doha had concluded late Wednesday with “no progress made”. But Iranian Foreign Minister Hossein Amir-Abdollahian said he believed the talks had been “positive” and a deal could still be reached. “We are determined to continue negotiating until a realistic agreement is reached,” he said after a phone call with his Qatar…