The territory argument is part of MSM propaganda. Russia is fighting a war of *attrition*, which it is winning massively. You only have to look at the ratio of bodies during exchanges to see this. The average is between 30:1 and 39:1.Today marks 4 full YEARS since the war in Ukraine started.
Russia is still only at around 20% of Ukrainian territory conquered, as they were 3 years ago.
The end of attrition wars usually come very suddenly, when one side has a total collapse. That will come this year, around summer time, following the Russian offensive that will start when the ground hardens.
Ukraine is on its last legs thanks to four years of heavy attrition. Russia by contrast has lost relatively few, and has several reserve armies not even deployed yet.
Once the collapse happens, Russia can take as little or as much territory as it wants with virtually no opposition.
Big arrow manoeuvre warfare comes at a heavy price, even if it goes well. The ratios are far more in favour of Russia with attrition warfare, and that is why they use it.