U.S. Secretary of State John Kerry (right) and Iranian Foreign Minister Mohammad Javad Zarif. Photo: U.S. State Department.

Washington and Tehran have set the stage for a heated last weekend of nuclear talks, with Iran’s leader sticking to tough “red lines” and U.S. Secretary of State John Kerry warning failure remains possible.

Whether or not Iran can satisfy the world that its nuclear program is entirely peaceful “will be determined in the last days, by whether or not the outstanding issues that we’ve been very clear about are in fact addressed,” Kerry said Wednesday.

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