[caption id="attachment_155752" align="alignright" width="195"] Iranian Foreign Minister Mohammad Javad Zarif (2nd R) seen along with US Secretary of State John Kerry (2nd L), Head of the Atomic Energy Organization of Iran (AEOI) Ali Akbar Salehi (1st R) and US Energy Secretary Ernest Moniz (AFP photo)[/caption]

This weekend marks the moment when negotiators attempt to finalise an accord that could launch a new era between Tehran and the west

It’s D-day for multinational talks on Iran’s atomic ambitions, as negotiators descend on Lausanne to try to finalise agreement on what nuclear technology Iran may pursue and what is beyond the pale.

The difference between success and failure could not be more stark. So what happens next if there’s a deal – and what would transpire if the talks failed?

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