France’s surprise veto with Russia and China exposes a fraying Western consensus, raising awkward questions about NATO’s future. For seven decades, the choreography of great-power diplomacy has been comfortingly predictable: when push came to shove at the United Nations, France stood with the United States and United Kingdom, balancing the habitual dissent of Russia and China. That symmetry has now been disrupted. In a jarring diplomatic turn, France recently joined Russia an