HARDtalk’s Stephen Sackur speaks to the adviser to Iran’s negotiators in Vienna, Mohammad Marandi. Time is running out for negotiators trying to break the impasse between the United States and Iran and revive the deal curbing Tehran’s nuclear ambitions. Iran is still enriching uranium; the Biden administration is talking of giving up on the current diplomatic track. If a nuclear deal can’t be done, how real is the danger of a catastrophic war in the Middle East?