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Iran has been pursuing self-sufficiency in military production since 1992.

The union’s foreign policy chief, Catherine Ashton, has said the door remains open for negotiations with Iran.

She has on Monday she had invited the country’s top nuclear negotiator, Saeed Jalili, to discuss the issue. EU officials said Iran was expected to accept the invitation and that talks could resume later this summer. Ashton said Thursday she was still awaiting a reply.

Associated Press writers Robert Wielaard in Brussels and Nasser Karimi in Tehran contributed to this report.