Did you read your own link?
Although Russia has obstinately described NATO expansion as a threat, Putin was actually more concerned about the loss of Russia’s perceived sphere of influence in former Soviet republics which were aligning themselves with the West economically and politically
So it wasn’t about NATO, it was about maintained a decaying sphere of influence.
Boris Bondarev, a Russian diplomat who later resigned in protest of Russia's invasion of Ukraine, recalled that the draft treaties had shocked many Russian diplomats and that he immediately viewed the demands as non-negotiable.
Even the Russian diplomats knew it was posturing while Russia added to the 100,000 troops already staging on the border with Ukraine. Demands made at the point of 100,000 guns pointed at you are not good faith negotiating positions.
What right does Russia have to formalized neutrality, to control Ukraine’s foreign policy? Do you think that, since “Germany is just a vassal state” that Russia deserves one too?
[ETA: formatting]