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Don't get mad at me if it's been done before.
"Throughout the time of the Russian tsars, there remained a kind of yearning for Constantinople..."- Isaac Asimov
In World War One, the Russian Empire (Or, more accurately, just the Czars themselves) had a stake in the war, that Russia would get Constantinople after the Turks had been driven out of Europe.
Vladmir Lenin saw to it that they would never achieve this dream.