An interesting perspective on the motivation behind the defense of the Black Sea port:
"The above brings us to the current Western perception of the Ukrainian crisis. Most of the people we speak to see the crisis as troublesome because it may lead to restlessness amongst the Russian minorities scattered across Eastern Europe and Central Asia, and tempt further border encroachments across a region that remains highly unstable. This is of course a perfectly valid fear, though it must be noted that, throughout history, there have been few constants to the inhabitants of the Kremlin (or of the Winter Palace before then). But nonetheless, one could count on Russia’s elite to:
a) Care deeply about maintaining access to warm-water seaports and
b) Care little for the welfare of the average Russian
So, it therefore seems likely that the fact that Russia is eager to redraw the borders around Crimea has more to do with the former than the latter. And that the Crimean incident does not mean that Putin will try and absorb Russian minorities into a “Greater Russia” wherever those minorities may be. The bigger question is that having secured Russia’s access to Sevastopol, and Tartus, will Russia use these ports to influence the Shia-Sunni conflict directly, and the oil price indirectly?"
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http://d21uq3hx4esec9.cloudfront.net..._19_2014_3.pdf