Marathon Iran nuclear talks near climax

Nerves are being tested on Day 17 of nuclear negotiations in Vienna, with China calling for "no more delays" in the marathon talks.

The stakes are enormous: Iran's nuclear ambitions put on a leash in exchange for a gradual lifting of UN sanctions, the opening up of a market of nearly 80 million to the West, and a possible review of old alliances.
Produced by Charles Wente, Van Meguerditchian and Michele Barbero

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