Thanks for getting me interested in it! I have found quite a bit on it but the above link was one I thought you might be interested in most.
I guess if it is good enough for Napoleon, Kaiser Wilhelm, Stalin and Hitler it is good enough for Putin! It seems to me that the previous 'Grand Strategy', from about the time of Alexander the Great's successors through Rome, Byzantium, the Islamic Caliphates, and even through the Crusades, was a naval supremacy theory based on the Mediterranean basin!