They couldnt hold the territory. Why not? I have a guess...ukrainian military pressure.
So you don’t understand military strategy at ALL????!!!!
After the initial first 4 months of fighting, Putin swapped out trained soldiers and put in militias. Now that most of Zelensky’s troops have been destroyed, the Russian army is coming back and is flattening infrastructure. Russia’s infrastructure is intact, many Ukrainians are sitting in the dark and cold without water.
Claiming that you’re forcing Putin troops from one location to another is not winning as the Russians beat the infrastructure into dust.