LAUSANNE, SWITZERLAND – Iran and six world powers ramped up the pace of negotiations on Tuesday ahead of a deadline for a preliminary nuclear deal that was less than 24 hours away, as both sides warned it was crucial to overcome differences that could wreck an agreement.
For nearly a week the United States, Britain, France, Germany, Russia and China have been trying to break an impasse in negotiations aimed at stopping Iran from having the capacity to develop a nuclear bomb, in exchange for an easing of international sanctions that are crippling its economy.
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