Israeli Prime Minister Benjamin Netanyahu castigated the U.S. diplomatic outreach to Tehran, telling world leaders Iranian President Hasan Rouhani is a "wolf in sheep's clothing" determined to use a political thaw to advance his country's nuclear program.

Mr. Netanyahu, addressing the United Nations General Assembly on Tuesday, said Israel would take unilateral military action against Iran if it felt the international community wouldn't act to stop Tehran from acquiring nuclear weapons.

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