The Bolshevik Revolution and Russia’s exit from WWI (Treaty of Brest-Litovsk, March 1918) handed Germany a massive—though fleeting—strategic windfall.
Victory in the east boosted German home-front morale and seemed to validate the “Hindenburg Program” of total war. However, it also hardened Allied resolve; U.S. troop arrivals accelerated, and the blockade strangled Germany’s economy.
The eastern occupation required garrison troops, sparked Ukrainian insurgency, and diverted logistics. By August 1918, the Western Front collapsed. Russia’s collapse bought Germany months, not victory.