Well if the current front lines are pretty entrenched, and it’s hard to take back occupied Ukrainian land, then just go take unprotected Russian land to make it even. Didn’t Putin say he was up for a truce if the current lines were kept? Let’s see how he feels about that when he has to give up Russian land. At the very least it will force Russia to relocate troops and resources.
I remember a story back at the beginning of the war of a Russian helicopter pilot defecting. He had other Russian soldiers in the helicopter with him, but they couldn’t do anything because he was the only one there who knew how to fly it.