核扩散讨论正在显著升温，多个国家与公众态度出现量化变化。韩国公众支持核威慑已上升至约70%，法国计划增加核弹头储备，波兰与沙特公开讨论获取核武。与此同时，美国与俄罗斯之间超过半个世纪以来首次缺乏具有约束力的军控协议，削弱了全球核限制框架。历史对比显示，核俱乐部从1个成员扩展到当前约9个历时超过60年，但增长速度可能加快。
安全事件与制度不确定性构成主要驱动因素。乌克兰在1994年放弃核武后于约20年内遭遇军事入侵，强化了“核威慑有效性”的认知；伊朗案例则显示“不完整核能力”既不能威慑又会引发对抗。美国安全承诺的不确定性削弱“核保护伞”可信度，使具备技术能力的国家重新评估“核潜力”策略。与此同时，核武使用间隔已达约80年，降低了公众风险感知并削弱文化层面的威慑记忆。
风险结构呈现数量与复杂度的非线性上升。尽管全球核弹头总量下降，但拥有者更加分散且理性程度不均。理论上，若核国家从约9个增加至13或14个，博弈参与者数量上升将提高系统失误概率。成本与维护复杂性仍构成扩散约束，但政策讨论频率上升表明规范性与道德约束正在弱化。总体趋势显示，在全球权力由单极向多极转变背景下，核武分布可能加速扩散，形成更高维度的不稳定均衡。
Nuclear proliferation discourse is intensifying, with measurable shifts in state behavior and public opinion. Public support for nuclear deterrence in South Korea has risen to about 70%, France plans to expand its warhead stockpile, and countries such as Poland and Saudi Arabia are openly considering nuclear options. Meanwhile, for the first time in over half a century, there is no binding arms control agreement between the US and Russia, weakening global constraints. Historically, the nuclear club expanded from one to about nine members over more than 60 years, but the pace may accelerate.
Security events and institutional uncertainty are key drivers. Ukraine surrendered nuclear weapons in 1994 and faced invasion roughly two decades later, reinforcing perceptions of deterrence value; Iran’s case suggests incomplete nuclear capability provokes conflict without providing deterrence. Uncertainty around US security guarantees undermines reliance on the nuclear umbrella, prompting technologically capable states to reassess nuclear latency strategies. At the same time, about 80 years without nuclear use has reduced public risk perception and weakened cultural memory of deterrence.
Risk structure shows nonlinear escalation with more actors. Although total warhead numbers have declined, ownership is more dispersed and less uniformly rational. If nuclear states increase from about nine to 13 or 14, the number of interacting players rises, increasing the probability of system failure. High costs and maintenance complexity remain constraints, but rising policy openness indicates weakening normative barriers. Overall, as global power shifts from a unipolar to a multipolar system, nuclear distribution is likely to expand, producing a higher-dimensional unstable equilibrium.