By John Irish, Parisa Hafezi and Michelle Nichols

PARIS/UNITED NATIONS (Reuters) -Britain, France and Germany will begin the process of reimposing U.N. sanctions on Iran at the U.N. Security Council on Thursday, two European diplomats said.

The trio, known as the E3, met Iran on Tuesday to try to revive diplomacy over the nuclear programme before they lose the ability in mid-October to restore sanctions on Tehran that were lifted under a 2015 nuclear accord with world powers.

Those talks did not yield sufficiently tangible commitments from Iran. The E3 have now decided to trigger the so-called snapback of U.N. sanctions over accusations that Iran has violated the 2015 deal that aimed to prevent Tehran from developing a nuclear weapon, the diplomats said.

The E3, whose ministers informe

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