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(L-R) China's Foreign Minister Wang Yi, French Foreign Minister Laurent Fabius, German Minister for Foreign Affairs Frank-Walter Steinmeier, High Representative of the European Union for Foreign Affairs and Security Policy Federica Mogherini, Iranian Foreign Minister Mohammad Javad Zarif, British Foreign Secretary Philip Hammond and US Secretary of State John Kerry pose for a picture during the final press conference of Iran nuclear talks in Vienna, Austria on July 14, 2015. AFP PHOTO / JOE KLAMAR        (Photo credit should read JOE KLAMAR/AFP/Getty Images)
(L-R) China's Foreign Minister Wang Yi, French Foreign Minister Laurent Fabius, German Minister for Foreign Affairs Frank-Walter Steinmeier, High Representative of the European Union for Foreign Affairs and Security Policy Federica Mogherini, Iranian Foreign Minister Mohammad Javad Zarif, British Foreign Secretary Philip Hammond and US Secretary of State John Kerry pose for a picture during the final press conference of Iran nuclear talks in Vienna, Austria on July 14, 2015. AFP PHOTO / JOE KLAMAR        (Photo credit should read JOE KLAMAR/AFP/Getty Images)

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The nuclear deal between Iran and the West has been a decade in the making. CNN's Nic Robertson on the specifics of the landmark deal.

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The nuclear deal between Iran and the West has been a decade in the making. CNN's Nic Robertson on the specifics of the landmark deal.