That offense in this war spares the infantry with carefully prepped artillery fire.
The traditional way of prepping for an infantry advance is that used in the “100 days” offensive of late 1918, which broke the German front.
This was the “rolling barrage” technique, which has been consistently used for the last 100 years. It is meant to suppress enemy defenders while the infantry advances.
This is apparently not being used by the Russians. Instead they are using the Somme, 1916 approach of blasting the defenders until, they hope, they are killed or driven away. This is vastly wasteful and didn’t really kill off the defenders. Worse, it only allowed for very short advances.
My understanding of how Russians fight is this: