Reality check: Ukraine mobilized the entire Ukrainian adult male population on day one. Ukraine's losses have been and greater than Russia's, and they have no additional people to mobilize (unless NATO wants to jump in and start WW3). Kherson was "retaken" to the extent that Russia moved across the river and waited for the Ukrainian forces to move in and get shelled.
Ukraine has been shelling Russian civilians in Donbas for nearly nine years. That's one of the primary reasons for the war, guy.