David Sachs is a brilliant historian and Director of the Center for Sustainable Development at Columbia University. For the past several decades he's advised many US presidents and was a special advisor to the UN Secretary-General.
I can think of few Americans more familiar with the history of the Soviet Union or it's breakup. If you want to understand exactly why Putin invaded spend 5 minutes on this video.
The lesson from this is you should not needlessly poke the Bear. You won't like the results.
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