Isn't that just Cold War 101? Both sides are supposed to know where the other side's red line is. And both sides are supposed to avoid creating ambiguous situat

Isn't that just Cold War 101? Both sides are supposed to know where the other side's red line is. And both sides are supposed to avoid creating ambiguous situations, where the other side may no longer know the red line. If the enemy does not know your red line, it's your fault. And if you don't know it yourself, your existence may be enough to start a nuclear war.