Five of the world's most powerful nations have agreed that "a nuclear war cannot be won and must never be fought" in a rare joint pledge to reduce the risk of such a conflict ever starting. The pledge was signed by the US, Russia, China, the UK, and France. A senior US state department official said the wording of the statement has been hammered out at P5 meetings over several months, despite the high-tension environment. "We underline our desire to work with all states to create a security environment more conducive to progress on disarmament," the statement said.

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