A week or two ago in his sitrep, Wyatt of DPA changed his sitreps a bit after he put forward a theory about how the war is fought how they capture ground.
https://yewtu.be/watch?v=vhocenrJeUY
https://youtube.com/watch?v=vhocenrJeUY [Embed]

He says they have bases in various settlements, where they can house X amount of soldiers, and they send them out to the trenches where they clash with the enemy as they try to hold/capture those. There is a range where it is effective to send the soldiers, and at one point it gets too dangerous due to enemy drones/mortar/artillery.
Russians try to pound these bases and suppress the traffic that is going between the bases and trenches. When the place gets sparse enough, they try to move in "on foot" and capture it.