If you call taking undefended open ground as winning, okie dokie.
If you call taking Liman/Lyman winning at the cost of huge numbers of Ukrainian lives winning. Okie dokie.
Winning or losing: both come with measurements.
And as long as the war/conflict carries on, those measurements remain fluid.
Russia is not taking territory because it has stalled.
Russia is not holding territory because it cannot defend it.
Both claims add up to losing. You are delusional if you think Russia can “win” when the nation cannot hold its gains in Ukraine. “Fluid” works when the war has only been lasting a short time and there is still some reserve strategy or strength not yet deployed. Its been nearly 8 months. What else does Russia have to change the balance?