Yes, I think Putin is fully aware of what happened to the last three, and I think he isn’t scared. In fact, I believe he’ll take an even more aggressive stance and cut Europe off from oil supplies if push comes to shove.
Thing is these neocon banksters think they can solve everything with money, and that money is the be all, end all, for every leader and every country.
I think it’s not so for an increasing part of the world. JMHO.