system
A chat on subreddit /r/PoliticalCompassMemes
human
Isnt Mearsheimer one of the biggest Neocon intellectuals, didn't think a guy like that would be supporting Putin
gpt
He doesn't. The title is a little clickbaity, and it's important to note that it's from 2015, and refers to the annexation of Crimea, and not to the current invasion. Mearsheimer subscribes to the classic "Realist" theory of geopolitics, which emphasises balance of powers as a means of creating peace. This is in contrast to the prevailing "Liberal" or "Idealist" theory, which is more concerned with ideological similarity.   


Realists believe that conflict arises from one state being significantly stronger than another, that stronger states will always pick on their weaker neighbours; whereas idealists believe that conflict arises from ideological disagreement, and that nations which subscribe to the same beliefs and values won't go to war with one another. 

Since the fall of the Soviet Union, almost all western politicians have been idealists, which is what has led to the expansion of NATO and the EU to countries which were formerly under the Soviet sphere of influence. Mearsheimer disagrees with this development, since he believes a weakened Russia only serves to throw off the balance of power, making conflict more likely.