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Global powers raced against the clock Monday on the eve of a deadline to nail down the final pieces of a framework deal aimed at putting any Iranian nuclear bomb out of reach. Adding to the drama, Russian Foreign Minister Sergei Lavrov left the crunch talks with Iran in Switzerland after a series of meetings, Russian media reported. Lavrov and his counterparts from the United States, China, Britain, France and Germany met with the Iranians in a lakeside Lausanne hotel on Monday for their first full session since missing a previous November deadline. Global powers have set a midnight Tuesday deadline to agree the outlines of a deal that they will then try to finalise by June 30.