GENEVA: After 18 months of talks, some of the world's top diplomats are nearing what could be the finish line for a deal on Iran's nuclear programme.

On Monday, Iranian leaders met in Lausanne, Switzerland with ministers from the United States, Russia, Britain, France, China and Germany for their first full session since missing a previous deadline in November.

A Western diplomat has described it as "yes or no" time.

Below are quotes from key players in the run-up to a new deadline midnight Tuesday for Iran and the P5+1 group of world powers to nail down the final pieces of a framework deal.

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