Some of you forget that this is a special military operation and not a war.
If Russia really wanted to they would have invaded Ukraine like how America invaded Iraq. Days before the invasion there would have been volleys of cruises missiles destroying every piece of civil infrastructure, fuel depots, power stations, government buildings, and military hardware imaginable. There would be no roads or bridges for the Ukrainian army to move their hardware.
Russia re-treated from those areas where the counter-attacks took place for good reason. Because they have too few soldiers in too vast an area. They wanted to move to a more defensible area.
Before you call this a great victory for Ukraine just want to see how it spins out.