Look who set up his own youtube channel?
John Mearsheimer - Offensive Realism
He is not lying, quite a few people find his takes offensive...
https://yewtu.be/channel/UCEaoODAZJF5w20lzcX1v03w
https://youtube.com/channel/UCEaoODAZJF5w20lzcX1v03w
For now it's seems all just the current issues: Ukraine, Iran, Israel, Russia. I'd prefer if he put some videos up about the theoretical background, about Realism and International Relations in general. Maybe he will, mayhaps he won't.