U.S. Special Envoy for Iran Robert Malley said on Sunday he was not confident that a nuclear deal between world powers and the Islamic Republic was imminent, dampening expectations after 11 months of talks in Vienna that have stalled.
The failure of efforts to restore a 2015 accord, which would curb Tehran's nuclear programme in exchange for lifting sanctions that have hammered Iran's economy, risks raising political tensions in the Middle East and further increasing world oil prices, analysts say.
