Looking at the force deployment differences between the Russians and Ukrainians, one has to note how their presence differs in the types of vehicles that they have so far deployed in the war.
The Ukrainians have been putting their wheeled BTR-4 IFV's into service while their fabled T-84M Oplot MBT was a no show.
On the other hand, the Russians have been throwing tanks into the fight, but their new VPK-7829 Bumerang IFV has been a no show.
This seems to highlight the fact that the Ukrainians are putting their stock on high mobility hit and run while the Russians are spending on heavy armour to steamroll the opposition.