Why is it nonsense khandro?
You seem to be missing the irony of the fact that Crimea ostensibly became "Russian" when it was, er, annexed by the Russians :-)
They annexed it, but it only became truly "Russian" ironically, after they lost the Crimean War, when Sevastopol was restored to them and it was a Soviet Republic for much of its life.
But regardless of who annexed what in the past, and who gave away what in a haze of vodka, does not excuse the blatant act of piracy for which Russia is now rightly being punished by Obama, the EU and others.
You could present similar arguments to justify any campaign of terror such as that by the IRA, ETA etc etc
Russia's sentimental attraction to Crimea is more to do with hazy ideas of imperial glory and the chance of a cheap sun tan in Koktebel than anything else :-) And Prince Vladimir was baptised there, but then St George wasn't exactly born in Dorking, nor St Patrick in Skibbereen.