The UK, France and Germany have called on Iran not to escalate tensions and to pursue negotiations after UN sanctions were reinstated on Saturday. The three countries said they had "no choice" but to bring back the sweeping measures against Tehran "as a last resort" over its "continued nuclear escalation" and lack of cooperation.

Britain said on Monday it had added 71 new designations under its Iran nuclear sanctions regime.

Iran's President Masoud Pezeshkian stressed last week that the country had no intention of developing nuclear weapons, and condemned the re-imposition of international sanctions as "unfair, unjust, a...