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总结
在冷战高峰期，美苏仍通过一系列军控条约限制核军备竞赛。如今美俄仅存、用于限制战略核武器规模并提供核查机制的条约即将到期，而双边关系因地缘冲突与互不信任持续恶化，核查与沟通渠道收缩。条约失效后，双方可能在缺乏透明度约束下调整部署，引发新一轮军备竞赛与误判风险，并迫使各方寻找续约、替代安排或新的谈判框架。
正文
Even at the height of their Cold War nuclear rivalry, the United States and the Soviet Union thrashed out a series of treaties to keep the arms race from spiralling out of control. US President George Bush and Soviet President Mikhail Gorbachev exchange pens after signing the START treaty. July 31, 1991 REUTERS/Mal Langsdon DISCLAIMER: The image is presented in its original, uncropped, and untoned state. Due to the age and historical nature of the image, we recommend verifying all associated metadata, which was transferred from the index stored by the Bettmann Archives, and may be truncated./File Photo
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