VIENNA — More than 30 months of Iran nuclear talks are coming to a frenetic diplomatic climax before a Monday deadline.

US Secretary of State John Kerry and Iranian Foreign Minister Mohammad Javad Zarif met last night and today, and canceled plans to fly to Paris andTehran, respectively, for consultations. Iran and six world powers aim to limit Iran’s nuclear program – ensuring it can’t produce a nuclear weapon – in exchange for relief of sanctions that have crippled Iran’s economy.