Iran and the United States must take a political decision within days to prevent the failure of indirect talks on reviving the 2015 nuclear deal after 11 months of negotiations rocked by a last-minute Russian demand of a sanctions exemption. The European Union’s top envoy Enrique Mora, who coordinates the talks, tweeted: “Just to clarify. There are no longer ‘expert level talks.’ Nor ‘formal meetings.’ It is time, in the next few days, for political decisions to end the #ViennaTalks. The rest is noise.” Mora’s Twitter post followed the departure of Iran’s chief negotiator Ali Bagheri Kani on M…