What if Russia ended up in the Central Powers in WWI? They were in the League of the Three Emperors in the past, but what if they managed to keep good relations with Germany, A-H and somehow change their relations with the Ottomans to be in the Central Powers? Maybe Nicholas II and Mehmed VI meet in real life and become good friends. Kind of a cop-out, but that's besides the point.
IMO this would be an absolutely kick-ass alliance. France would be pretty much facing an enemy that ran from their border all the way to Korea and beyond. The Russians and Ottomans could work together really well against the British as well as I imagine it.
WWI as we know it would be effectively butterflied away but what if something else led to war in 1914? Something like the Dogger Bank incident happening again could lead to a war with the Allies. Do you guys think this alliance could beat the Allies? How differently would the war go with Russia in the Central Powers? If they did win a decisive victory, how much could they conquer?