Not in the form in which binding, durable, heritable international commitments are made it was not.
Not even the people most committed to spinning the evidence in favor of Russia bother to claim that (which is good, because it would be obviously false), they just try to get people to ignore that,and pretend what would even by the most favorable interpretation of the evidence be private assurances were binding commitments in future governments of the state whose representatives made them, in radically changed circumstances, inheritable by a state that didn't exist as an independent subject of international law at the time they were given, applicable after the state they were given to ceased to exist by, primarily, the action of the entity claiming to exercise them.
And they go further, and make arguments that rely not only on them being still binding, but on violation of them being an act equivalent in international law to an actual or imminent attack justifying war against third parties who aren't even under any theory involved in the supposed agreement except possibly as a co-inheritor with Russia of the interests of the USSR.
This is a common talking point with no relevance to reality. This is a war for resources (Crimea and the Donbas), a demographic injection to prop up Russia's own dwindling population, and, at the very least, a land bridge and warm water ports. How does subjugating Ukraine stop NATO exactly? Especially when NATO rejected Ukraine's bid.
It's a fig leaf. Any scrutiny at all reveals the true face of this conflict.
But even as an argument it conveniently denies self-determination, agency, hopes and dreams to the countries, nations and people who don't want to be ruled by post-soviet mafia.
The US has been incapable of putting ourselves in the shoes of a has-been empire, so when Russia sees expansion as a threat, we can't fathom what their fuss is about. But if you look at it from Russia's perspective, as a post Soviet Empire that is in severe retreat and is beset on many fronts, one can begin to understand some of their PoV, especially given the Syria-Ukraine-Caucasus entanglement stoked by Obama. Obviously a cretin like Putin takes all this as personal affront on behalf of all Slavs and results in this disaster.
It pursued that direction anyways, because what (aside from nuclear war) is the worst that could happen..?
(A full invasion of Ukraine, as it turns out is the worst thing that can happen - so far. But that's no sweat off the backs of anyone on this side of the Atlantic.)
Now, where are these people, why don't they pipe up and tell us that they told the higher ups what would happen but got ignored? Why can't we be honest that we made a grave mistake in this case?
if all Russia wanted was Donbas they could just go here, take it, and eject the ethnic Ukrainians if they like, and steal the resources and territory instead of paying for them. Instead they go all-in on destroying as much of the country as possible before they most likely retreat to a relatively small region in the east, which I think was the original objective.
Russia chose to commit this massive crime, no one else.
But we have to be careful of what stages we are setting up. another example is the "Mujahudeen". Yes, convenient thorn in the Soviets' ambitions but they would come back to haunt us. It's still their fault for their acts of terror, but we also gave them "life" by setting up the stage for them.
If we look at the timeline, US signaling intent to expand nato lines up perfectly with Russia’s belligerence, and it’s not exactly subtle.
Putin more or less said “we won’t stand for this” at the time.
Perhaps it is a lack of empathy as implied by the parent comment, but that seems surprisingly oblivious.
[1] https://www.theguardian.com/world/2022/jan/12/russias-belief...