The leaders of Germany, France and Britain on Sunday urged Iran to uphold an international agreement to curb its nuclear ambitions, saying the deal had played a key role in preventing the proliferation of nuclear weapons.

“It is essential that Iran return to full compliance with its commitments under the agreement”, - German Chancellor Angela Merkel, French President Emmanuel Macron and British Prime Minister Boris Johnson said in a joint statement.

The Joint Comprehensive Plan of Action was agreed in 2015 between Iran and the five permanent UN Security Council members - the United States, Russia, China, France and Britain - plus Germany and the European Union.