John Mearsheimer has a really great video from 6 years ago about Ukraine that I found fascinating: https://youtu.be/JrMiSQAGOS4 Basically, he thinks the west precipitated the crisis by pushing to have Ukraine join NATO, and he thinks it should remain a buffer state between NATO and Russia
This is a downright lie. Anyone who follows NATO knows that there has been very little desire to allow Ukraine to join.