Russia's attitude to that treaty is that they didn't sign it with the current gov that achieved power by what was essentially a coup. Then Crimea factors which from Russia's point of view are strategic. Where warheads are is too. Also forces.That agreement was also with Russia, and it did not prevent Ukraine from voluntarily seeking NATO membership.
Ukraine–NATO relations - Wikipedia
en.wikipedia.org
Such seeking of membership was only restarted following Russia's invasion of Crimea.
Geopolitics which is part of what we are looking at just needs plausible truth. The above is. Little does it matter what you and I think about it. This time the coup aspect has been clearly stated by Russia. Usually in the geopolitical area there is a need to watch what happens and figure it out yourself or it nay become clearer later, Eg Russia no longer a world power of any repute. Eg no weapons of mass destruction so what was that really about. Maybe Sadam's ideas about getting others to join him and attack Israel. Maybe it was oil related.Kuwait was.