Even as he threatened to escalate an unlawful war sold in part as preventing Iran from gaining a nuclear weapon, Donald Trump opened the door to proliferation in the region on Wednesday. The US announced that it had signed a deal with Saudi Arabia which would potentially allow the kingdom to enrich uranium in future and to avoid the fullest inspection rights for the international watchdog.

Experts have long warned that a civilian nuclear programme could create a path towards a nuclear-armed Riyadh. Mohammed bin Salman, the Saudi crown prince and de facto leader, has said that if Tehran gets a nuclear weapon, “we will have to get one”. Concerns are magnified by the agreement’s terms. Washington previously argued that the “gold standard” was the United Arab Emirates’ agreement to permanently forgo enrichment and accept full monitoring by the UN’s International Atomic........

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