There really is no such thing as missile stealth. Just penetration aids: https://en.wikipedia.org/wiki/Penetration_aid https://en.wikipedia.org/wiki/Penetratio

There really is no such thing as missile stealth. Just penetration aids: https://en.wikipedia.org/wiki/Penetration_aid https://en.wikipedia.org/wiki/Penetration_aid Both sides worked endlessly on producing and overcoming these and in hindsight a lot were snake-oil. I seriously doubt any ICBM could come down undetected at any time during the cold war. The US had listening/detection posts very close to Soviet territory via NATO nations. The Soviets also had listening/detection posts in Siberia, Cuba, and South America.