I was listening to a podcast about a Scandinavian sounding rocket causing Boris Yeltsin to insert the key/codes in the nuclear briefcase and nearly pushed the b

I was listening to a podcast about a Scandinavian sounding rocket causing Boris Yeltsin to insert the key/codes in the nuclear briefcase and nearly pushed the button to launch a counter attack if that rocket were a surprise American attack. Apparently, it was proactive readiness and the Russians only disclosed week/s on to not alarm people unnecessarily.