Actually, there is a need for the Russians to defend themselves from the US.
The US has turned many, if not most, of the non-Russian republics against the Russians, and not just in ideology, but economically.
The US spent $5 billion to destabilize Ukraine.
http://www.politifact.com/punditfact/statements/2014/mar/19/facebook-posts/united-states-spent-5-billion-ukraine-anti-governm/I know that I did not vote for my government to piss away any $5 billion to mess with Ukraine and its people.
The US did not threaten the military takeover of the USSR, nor was it likely to bomb them into oblivion, but it is not true that the USSR was not threatened by the US.
I am no fan of Vladimir Putin, he is a nondemocratic semi-dictator and a ruthless manipulator. But that does not mean that Crimea was ever really an integral part of Ukraine.
It is also not really an integral part of Russia, either. I am all for Crimeans deciding for themselves what they want to be. Not that this will ever happen.
I see the concern for ethnic Russians being mistreated by vindictive locals to be a subject worthy of attention by Russia, just as the US was concerned for the Americans who lived in Panama when Noriega was harassing them.
I admire Gorbachev a LOT MORE than I admire Reagan.