Morale
Morale of your troops is as important as having adequate supplies and good leadership. For the Russian Army to suffer this type of casualty and the loss of so much equipment can not help but affect troop morale, and not in a good way.
The primary goal of warfare is not to kill (or wound) the enemy but to break their will to fight. Once they no longer want to fight they lose.
The smart thing for the Russians to do is pull their troops back to a secure and defensive area and begin to rebuild their forces.
Allow them time to rest and re-group, get replacements, and supplies.
The smart thing for the Ukraines is not to give them time to rest and regroup.
Sun Tszu could not have said it better..................
By using the same outdated armor vulnerable to shoulder fired and drone fired anti-tank weapons. Everyone needs to learn the lessons of this war, the US Army included.