You said it yourself the reporting is not all the same. The facts are unclear; news reporting is a matter of perspective.
...as for your claims about Russia's advancements, they are not moving so quickly or so easily, though they may be advancing in absolute terms, the Ukraine has yet to make the same efforts attacking; they hold their positions defensively.
In effect, neither party has demonstrated the capacity to be an overwhelming fighting force as yet.
...what does Russia gain from its fighting but rubble?
And what should be Russia's advantage, its weaponry, shall be challenged if reports are true, quite soon.