The defense of the current borders seems to ignore the much more important geopolitical reality. Russia conquered the Crimea to gain access to the Black Sea. They built their southern naval base at Sevastopol in Crimea. Until the Russian Revolution no one would have thought of Crimea as part of Ukraine and even today there are few Ukrainians there. When the USSR collapsed Ukraine inherited Crimea through its USSR administrative borders, borders that had only existed for about 80 years.
This particular border is much younger than that; the Crimea was only transferred to the Ukrainian SSR in 1954.
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