The U.S. is sending 1,000 more troops to the Middle East as tensions in the Persian Gulf mounted Tuesday over Iran’s announcement it will not comply with the international agreement that keeps it from making nuclear weapons. At the same time, Iran insisted it was not seeking war.

Iran’s announcement Monday that it could soon start enriching uranium to just a step away from weapons-grade levels challenged President Donald Trump’s assurances to allies that the U.S. withdrawal from the deal last year made the world a safer place.

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