We all know that throughout much of Russia's history, there have been wars of aggresion waged at Constantinople. This would give Russia a port to the Med, and by extension the rest of the worlds oceans. I am not sure when it is more plausible for this to happen, whether in the Crimean war, or one of the subsequent wars with the Ottomans.
What I'm wondering is the effect of if this had happened on the world. Would we see a Russian Superpower? An Anglo-Russian war? This would have been interesting in the late 1800's as Russia may have moved against India.
Or would this have resulted in an all European War against Russia? I am forgetting my sources, But I beleve that this was actually a fear in Russia in the 1800's.