It was only one paragraph buried deep in the most plain-vanilla kind of diplomatic document, 40 pages of dry language committing 189 nations to a world free of nuclear weapons. But it has become the latest source of friction between Israel and the United States in a relationship that has lurched from crisis to crisis over the last few months.

At a meeting to review the Nuclear Nonproliferation Treaty in May, the United States yielded to demands by Arab nations that the final document urge Israel to sign the treaty -- a way of spotlighting its historically undeclared nuclear weapons.

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