You have to remember that Russia is a basket case. It has almost no quality industrial capability that is not arms related. The whole economy was geared toword the military in attempt to never never allow other Europeans to invade and kill millions of Russians.
Somehow when the USSR breathed it's last, the change possible in the economy never occured. The economy and the potential for modernization and growth never really happened. The oligarchs, led by Al Gore and Marc Rich siphones all the capital to Switzerland. The primary workforce is mostly alcoholic. The women can't do all that needs to be done. Russian oil is consequential but inadequate to shore up his economy. He has no manufacturing base with quality products suitable for export. Commodity prices are down. Russia is doomed.
Putin knows this. He knows it only too well.Today, Putin has no choice but to to go to his only resource of consequence, his military manufacturing capability. That's all he has. I don't see his arms sales as purely anti American nor a resumption of the Cold War. It is sheer economic necessity. Sell arms or die.
I wonder how the Pentagon would feel about buying Russian weapons then. Or would it further diminish Russia's technical class if they all moved over here...