By Emma Farge, John Irish and Parisa Hafezi

GENEVA (Reuters) -Senior officials from Iran and Europe's top three powers are due to meet in Geneva on Tuesday to discuss the Westerners' demand that Iran revive nuclear inspections and diplomacy or face the reimposition of sanctions that were lifted under a 2015 deal.

France, Britain and Germany, known as the E3, have long threatened to trigger the "snapback" of sanctions at the United Nations Security Council by October 18, when a now largely defunct nuclear deal struck 10 years ago between Tehran and major powers expires.

They have more recently said they plan to decide by the end of August unless Iran offers concessions that could convince them to hold off for a short........

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