WI: Ottomans join the Entente

what is with these ideas of supplying Russia? With what exactly? the French and British had massive shortages of weapons and ammunition versus the needs and demands of their own field divisions even late into 1916 despite massive purchases of US equipment; are they going to strip their own field divisions to bulk up Russian divisions?

Not only that problem, but Russia actually produced enough to supply its armies by 1916, and its production in 1917 added to that of 1916 was enough to supply the Red Army for the whole of the Russian Civil War. Ottoman impact in terms of Russia's economy was in choking off agricultural trade, not in impacting Russian military production.
 
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