Palais Coburg in Vienna where negotiations to revive the 2015 Iran nuclear deal are being held. Photo: Reuters/Leonhard Foeger The United States needs to make a decision to revive the Iran nuclear deal, Tehran’s Foreign Ministry Spokesperson Saeed Khatibzadeh said on Monday amid fears that talks in Vienna to revive a 2015 agreement may collapse. Talks to salvage the pact were in danger after a last-minute Russian demand forced world powers to pause negotiations for an undetermined time despite having a largely completed text. Iran’s Foreign Minister Hossein Amirabdollahian will visit Russia on Tuesday, Khatibzadeh said, without elaborating. “We are...