Vienna — The EU has initiated formal proceedings to resolve its nuclear dispute with Iran, setting up a potential showdown between Washington and Tehran at the UN Security Council.

The foreign ministers of France, Germany and the UK informed EU foreign policy chief Josep Borrell of their decision on Tuesday. In the 2015 accord, known as the Joint Comprehensive Plan of Action (JCPOA), Iran agreed with the US, Russia, China and the three European countries to include a dispute resolution mechanism. That could be used to send Iran back to the UN to face a re-imposition of UN sanctions, including on arms imports...

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