Outcome of a Franco/Russian-German war?

If WWI would have turned out differently, say as was thought (can't really remember sources right now) and it was Germany against Russia and France; would germany have won?

How would this effect the world; would this lead to a world war between france/russia and germany and its new european dominance?

if there was a second war, where would the us and the uk stand? What of Japan?
 
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