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Iranian Foreign Minister Mohammad Javad Zarif said he had a constructive meeting with EU Foreign Policy Chief Federica Mogherini in Brussels on Tuesday. The Iranian diplomat is on the final leg of a global tour to rally diplomatic support for the 2015 nuclear deal after the US withdrawal. In the meeting, Mogherini said the EU is determined to make sure the agreement is respected. Zarif will later meet his counterparts from Britain, France and Germany... the three European signatories to the deal. Our correspondent Jack Parrock in Brussels explains.