This video, despite being from 2015, provides clarity on the current Ukraine crisis. Putin quite clearly will not stand for NATO being on Russian’s border. Mearsheimer advocates a neutral Ukraine—a buffer state between Western Europe and Russia and argues that Putin will try to bring Ukraine to its knees rather than let it be in NATO. This is apparently happening now.
Mearsheimer, of course, co-authored The Israel Lobby and U.S. Foreign Policy, a masterful attempt to wrest U.S. foreign policy away from the clutches of the Israel Lobby (my review.) Sadly it has had no effect on U.S. policy since publication in 2008. Mearsheimer is an insightful, honest interpreter of foreign policy and makes clear his contempt for American foreign policy elites.