Nine years ago, Barack Obama, with his vice president Joe Biden at his side, announced the Iran nuclear deal. Ayatollah Khamenei’s regime would not enrich weapons-grade uranium for 15 years. The US would lift economic sanctions in return. It was ‘historic’, said Obama. The Iranians had been close to developing their first nuke: this agreement stopped them. ‘This deal demonstrates that American diplomacy can bring about real and meaningful change – change that makes our........

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