From my experience with this game it seems unlikely Russia can ever hold all of its original territories in the East. If Russia leaves its whole stack of infantry in Amur then Japan will surely murder them with troops from Manchuria and Japan and their gigantic air force. If Russia does the smart thing and fall back most of its troops to Buryatia then Japan will control Amur, Siberia, Sakha, and the Soviet Far East for the entire game.
Based on the fact that Japan can take Russian territories in the East at will, it seems unlikely Russia could ever get its NOs for holding all original territories and pushing into Germany, even if it retakes all Russian territories from the Germans in the Eastern front. Has anybody gotten these NOs?