This is from 2015. The Russian Federation had invaded Crimea and annexed it. The explanation for Putin’s aggression is explained. This will help you make sense of why Russia is motivated to defeat Ukraine. And why Putin is a nineteenth century leader facing twenty-first century bureaucrats in Washington DC.
It’s long. But it’s fascinating and puts so much into perspective. John Mearsheimer’s lecture is a must watch for anyone wanting to understand the origins and causes of the current war in Ukraine.