The Russian liberals, the bourgeoisy, were the original war party. The Tsar had gone to war in 1914 more for fear that they stage a revolution in case he dogded the confrontation - than for defending Serbia.
So, it will take the Petrograd workers to assume complete control already in the initial revolution.
A Russian peace offer in March 1917 may save Bethmann Hollweg from downfall. Thus, Russia would not have to deal with Ludendorff's ideas but with a more practical approach by Bethmann and Zimmermann.