People probably don't want to hear this, but a superior tactic for breaking the morale of enemy combatants that are conscripts, is putting fear into their minds, that should they be caught, it's going to be terrible for them.
When you are already psychologically terrified and don't want to be there, knowing your fate is death, or suffering doesn't build resolve in you like it might for a professional soldier. It further debilitates you. It causes you to want to flee, desert or rebel. Many of these transcripts know that they have no business being in another country terrorizing the people. If it gets out to them that the Ukrainians are going to show them little mercy if they catch them, it's only going to damage them more from a psychological perspective.
There is nothing worse than knowing that your own government doesn't care about you and sees you as cannon fodder, and will kill you / arrest you if you refuse to fight, and at the same time, the enemy might treat you just as poorly if they catch you. Psychological hell.
Very, very important for breaking the morale of Russian conscripts.