Iran gives positive signals on informal nuclear talks, time short - sources

FILE PHOTO: An Iranian soldier stands guard inside the Natanz uranium enrichment facility, 322km (200 miles) south of Iran's capital Tehran March 9, 2006.REUTERS/Raheb Homavandi

PARIS (Reuters) - Iran has given encouraging signs in recent days about opening informal talks with world powers and the United States, two European sources said on Thursday after European powers scrapped plans to criticise Tehran at the U.N. nuclear watchdog.

Iran has so far refused to take part in a meeting brokered by the European Union between world powers and the United States on reviving its 2015 nuclear deal.