In August 1993, as the shadow of the Cold War began its slow retreat, the United Nations (UN) Conference on Disarmament decided the time was ripe to negotiate a treaty banning nuclear tests once and for all. The end of superpower competition had led three of the five official nuclear powers – the United States (US), Russia, and Britain – to announce testing moratoriums, and nonnuclear states were eager for a universal ban.1 The biggest potential spoiler was China. A “vocal outsider to the global nuclear order”2 and a “latecomer to the nuclear club,”3 China had historically viewed test ban efforts as “ploys intended to monopolize nuclear weapons and solidify the larger nuclear powers’ advantages.”4