Cuban officials have said on several occasions that they were open to dialogue with the U.S. as long as it was based on respect for Cuban sovereignty, but they have never confirmed that such talks were taking place.
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苏联曾开发出名为“周界”（Perimeter）的自动核报复系统，西方分析人士称其为“死手”（Dead Hand）。此系统的设计目的在于保证即使遭受斩首式打击，威慑依然存在，确保敌人无法轻易摧毁报复能力。
3014245510http://paper.people.com.cn/rmrb/pc/content/202602/27/content_30142455.htmlhttp://paper.people.com.cn/rmrb/pad/content/202602/27/content_30142455.html11921 中华人民共和国原子能法