Last night I was watching on Apple TV+ a 9/11 documentary. Condoleezza Rice tells how on the very first hours of the attack the US goverment tried desperately to contact the Russians and assure them that the air traffic chaos that ensued from closing the US air space wasn´t a move to launch an ICBM or other kind of attack over Russia.
Sure enough, when they got to Putin, he said "Yes, we know this wasn´t you. Don´t worry about us."
Condoleezza thought "Now I know the Cold War is over..."