The US already promised them it would not expand NATO eastward. I don’t think they’re gonna buy any more promises from the US/NATO.
And Russia promised to respect Ukraine’s borders, a promise they broke in 2014 with the first invasion, all without the pretext of NATO expansion. NATO expanded eastward not because of western aggression but because the eastern nations were fearful of their former Russian overlords, and with just cause. Enough with this nonsense that Russia is the aggrieved victim here.