 《防止意外事故措施协定》(《美利坚合众国和苏维埃社会主义共和国联盟关于减少爆发核战争危险的措施的协定》)和《改善美苏直接通信联系措施协定》(及附件《对 1963 年 6 月 20 日谅解备忘录及附件的补充和修改》)于 1971 年签署并生效，其目的包括提供即时或预先通知并通过“热线”便利紧急通信。
• The Accidents Measures Agreement (Agreement on Measures to Reduce the Risk of Outbreak of Nuclear War Between the United States of America and the Union of Soviet Socialist Republics) and the Agreement on Measures to Improve the USA-USSR Direct Communications Link (with Annex, Supplementing and Modifying the Memorandum of Understanding with Annex, of June 20, 1963) were signed and entered into force in 1971, inter alia, to provide for certain immediate or advance notification and to facilitate urgent communications via the “Hotline.”