Russia does not have heavy casualties compared to Ukraine. The initial assumption may only be true for equal opponents, which is not the case - Russia has gargantuan advantage in artillery, armored vehicles, total domination of the skies, powerful long-range strike capacity, and now even drones. It has more of everything, including total manpower, and its military industrial base is vastly more powerful than anything the Western empire can muster. If a boxer can only punch once and then gets punched 9 times - that's not "equal".

The other factor is the fact that we're talking about attrition warfare, where there's close to zero big arrow maneuvers, instead the Russian military is methodically grinding down the AFU until its combat capacity is negligible. That helps Russia keep its casualty numbers low, regardless of what Western propaganda press is trying to convince the public of. So it actually gets easier for Russia the longer it goes on - because at some point the AFU will not be able to hold the line, which is going to end up in the general collapse of the front line. If you destroy your opponent's ability faster than they destroy yours and you're more powerful to begin with - the collapse is a mathematical certainty.

Also - Russia does not want to occupy all of Ukraine, that goes directly against their economic interests and it is something they want to avoid if possible.

Neither of those statements is true. Russia is suffering less casualties than Ukraine because they have an enormous firepower advantage. And the most heavily fortified and urbanized part of Ukraine is the Donbass. It actually has been getting easier for Russia the more it has broken through those lines that have been fortified since 2014, and the more it has attrited and degraded the army that NATO had trained and equipped in Ukraine, leaving Kiev having to increasingly resort to dragging unwilling and unfit conscripts off the streets.

Yeah, that's probably the case.

I think the comment you were replying to earlier didn't leave out Russians because they weren't suffering casualties. More likely folks are going to be more sympathetic to the defenders in this war, especially with manpower shortages leading to more and more people unwilling to fight being forced to the front line.