Oh here we go again. Unless it is written in a specific manner using certain precise words and signed by specific people on a pre-determined date at a coordinated location before a full moon and drenched in the blood of a newly slaughtered unicorn then it isn't real.
There were assurances that NATO would not expand eastwards, everybody knows it. There is documented proof but still you numpties want to continue to behave like ostriches. Well go ahead, the embarrassment in this whole conflict is that "pathetic, poorly motivated and under-equipped" Russia is kicking Ukraine's rear even with the aid of a foreign legion and billions in the latest western weapons. The conflict only ends in one way; and that is how Russia decides it.
The all powerful NATO has become a joke that will not enter the conflict because they know that it would mean; the end of NATO. It would also drag China, North Korea and Iran directly into the fight and there is no way the west can stand up to that and they know it. So rather appear tough than have to prove it.