This is, of course, complete nonsense. It is as much a fact as the oft-cited claim that NATO promised not to expand (another lie that is true only to rubes).
NATO has a requirement that you settle any ongoing border disputes before ascension: If you have a simmering feud with a neighbor country about who owns a pile of rocks, it's such an obvious flashpoint that you need to resolve it first. It has zero requirement that you don't threaten the tyrannical empire building pursuits of the neighboring madman.
Russians defending Russian aggression is something that I find just impossible to believe. Putin has sent tens of thousands of Russians into a meat grinder for a futile, ego-driven war that has zero outcome that isn't negative for Russia for decades to come. And he's going to keep grinding those bodies into corpses and you'll keep talking about deNazification or whatever nonsense you're fed.