Iran nuclear deal pulled back from brink of collapse as talks resume in Vienna

Cautious optimism as Tehran revises its position after pressure from Russia and China

Efforts to revive the Iran nuclear deal have been hauled back from the brink of collapse as Tehran revised its stance after pressure from Russia and China and clear warnings that the EU and the US were preparing to walk away.

The cautiously optimistic assessment came at the start of the seventh round of talks on the future of the nuclear deal in Vienna. It follows what was seen as a disastrous set of talks last week in which the US and the EU claimed Iran had walked back on compromises reached in previous rounds.