Nepal, July 25 -- Iranian diplomats will meet counterparts from Germany, Britain and France on Friday for renewed nuclear talks, amid warnings that the three European powers could trigger "snapback" sanctions outlined under the 2015 deal.

The meeting, set to take place in Istanbul, will be the first since Israel's mid-June attack on Iran, which sparked a 12-day war and targeted key nuclear and military sites.

Israel's offensive -- which killed top commanders, nuclear scientists and hundreds of others as residential areas were struck as well -- also derailed US-Iran nuclear talks that began in April.

Since then, the European powers, known as the E3, have threatened to trigger the "snapback mechanism", which would reinstate United Nation...