> USSR was also once told in ~1990 “no NATO expansion to your doorstep”.
No, they weren’t, as even Gorbachev admitted, and even if they had been given private assurance not memorialized in a treaty or even a formal executive agreement, there would be no reasonable expectation of a binding commitment that survived the administrations on each side then in power, much less an actual collapse of the Soviet Union.
It’s not like the Soviet Union didn’t understand the mechanics of how binding international commitments are formed.
No, they weren’t, as even Gorbachev admitted, and even if they had been given private assurance not memorialized in a treaty or even a formal executive agreement, there would be no reasonable expectation of a binding commitment that survived the administrations on each side then in power, much less an actual collapse of the Soviet Union.
It’s not like the Soviet Union didn’t understand the mechanics of how binding international commitments are formed.