I posted link to multiple documents
Declassified documents show security assurances against NATO expansion to Soviet leaders from Baker, Bush, Genscher, Kohl, Gates, Mitterrand, Thatcher, Hurd, Major, and Woerner
https://nsarchive.gwu.edu/briefing-...rd-western-leaders-early#.WjAX9r_XxYI.twitter
The documents show that multiple national leaders were considering and rejecting Central and Eastern European membership in NATO as of early 1990 and through 1991, that discussions of NATO in the context of German unification negotiations in 1990 were not at all narrowly limited to the status of East German territory, and that subsequent Soviet and Russian complaints about being misled about NATO expansion were founded in written contemporaneous memcons and telcons at the highest levels.
The documents reinforce former CIA Director Robert Gates’s criticism of “pressing ahead with expansion of NATO eastward [in the 1990s], when Gorbachev and others were led to believe that wouldn’t happen.”[1] The key phrase, buttressed by the documents, is “led to believe.”
"Considering and discussing" is not a legally binding guarantee or treaty.
The bottom line is you are looking to give an excuse for Putin to invade a neighboring sovereign country.
This ain't it. This provides no legal or moral justification
for the Kremlin, should Putin invade Ukraine.