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The Russians are not fighting in pure battalions but in Battalion Tactical Groups.
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BTG are a western construct - no one in the orc or UA army has a clue about such a thing

Here’s the actual structure of Russian Mechanized Infantry Brigades according to the UA and the RGF:

The RGF once used the Army with many Divisions. But that was during WWII and the cold war. Since there were no more major wars, the RGF downsized its unit division from Division to Battalion. However since 2012 or so they have begun to convert back to Division.

Now there is a mix of unit designations Division and Battalion.

None of the smaller divisions are even close to Western unit make up (totally forget the “BTG” terminology - a Western construct).
For instance: there are 2 kinds of Mechanized Infantry Brigades, each with a different, but similar, make up. Call them Type A and Type B.

Type A has 2 tank battalions (~60 T-72 tanks), 2 Infantry battalions, Engineer battalion, Recon battalion, 2 self propelled arty battalions (could be up to 3 battalions), MLRS (Grad) battalion, AA battalion, Comm battalion, UAV battalion (Orlon-10), Sniper battalion, and Support battalion. Self-sufficient.

Type B has 3 infantry battalions (mixed as A& B below), 1 Tank battalion.

Infantry battalions in each Brigade are of two types, call them A & B.
A has ~540 troops, 49 BTR-82s, 8 120MM Mortars, 6 AGS-17s, 15 AT missile. 3 SPG-9s. 3 companies of about 109-110 troops.
Fighting force about 300 troops.

B has ~460 troops, 42 - BMP-2s, 8 120mm mortars, 6 AGS-17s, 15 AT missiles, 3 SPG-9s. 3 companies of 91 troops.
Fighting force about 270 troops.

Troops on the frontline are never more than half, but more like 40%

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They took pieces from intact Divisions and Brigades to make the original unit make up at the start of the invasion. This cannot be fixed.