Cold War plans to continue government and war after nuclear attack

Did Cold War states plan to continue fighting during and after a strategic nuclear exchange?

Yes; Sweden, Finland, NATO states, and Switzerland all planned for continuity, with Switzerland building the most population-wide shelter system.

Sweden and Finland are identified as having highly developed plans for fighting and governing through a strategic nuclear exchange. NATO countries technically maintained plans as well, although official possession did not equal confidence in execution. Switzerland pursued the most comprehensive civil-defense approach by providing shelter space and supplies for its whole population. That contrast separates military continuity planning from a national system designed to preserve nearly everyone until radiation levels declined.