Iran and the United States started a new round of nuclear talks in Rome on Saturday to resolve their decades-long standoff over Tehran's atomic aims, under the shadow of President Donald Trump's threat to unleash military action if diplomacy fails.

Iran's Foreign Minister Abbas Araqchi and Trump's Middle East envoy Steve Witkoff will negotiate indirectly through an Omani official who will shuttle messages between the two sides, Iranian officials said, a week after a first round of indirect talks in Muscat that both sides described as constructive.

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