Maersheimer has basically destroyed his reputation with his nonsense on hubris on Ukraine. Not only is he wrong be he refuses to admit he's wrong even when his contortions make him sound like an idiot. Example claiming Putin is not an imperialist

Actual history shows NATO bent over backwards to appease Russia (hint how many non local troops did nato have near russian borders before 2022? Almost none)and that Ukraine was not about to join NATO in 2022 or 2014 and that everyone including Putin knew this. Hell after the revolution of dignity but before the Russian invasion of Ukraine/local coups(Crimea in the south and parts of eastern Ukraine) Ukraine wasn't even seeking to join NATO, it was seeking to join the EU (which was also at best a difficult goal tha5 would take a long time).