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Germany and Russia are the most populous nations in Europe and are both extremely powerful. Britain and France got lucky that the two of them went at it TWICE in which ensured German defeat.
Say they decide to work together in either WWI or WWII. After all, Germany's main problem was France (Alsace-Lorraine) and Russia's main problem was Britain (the Great Game) so an alliance could easy be formed in both wars on a "I scratch your back if you scratch mine" deal.
Is there any way a coalition of countries could beat the alliance if the wars start in 1914 and 1939 as OTL?