DUBAI (Reuters) -The United States needs to make a decision to wrap up a deal to salvage Iran’s 2015 nuclear accord with world powers, the Iranian foreign ministry spokesperson said on Monday amid fears that talks in Vienna might collapse. Efforts to clinch a new deal were left in limbo after a last-minute demand by Russia – now at odds with the West over its invasion of Ukraine – forced the powers to pause talks for an undetermined time despite having a largely completed text. Iranian Foreign Minister Hossein Amirabdollahian will visit Russia on Tuesday, ministry spokesperson Saeed Khatibzade…