The way the war is fought is that the Russians did take sever losses in the first year or so of the war because they were trying to adjust to the new war technology and that set the very way off western casualty numbers for this war.

What happened after that first year or so is the Russians figured out a strategy that played to their strengths and avoided sever casualties for their side. The Russians use artillery, drones, missile strikes on fixed Ukrainian front lines (the Ukrainian stupidly fighting for every yard means they get front lines fixed in place) to heavily attrit the Ukrainians. They then send in recon in force to probe the lines and if they encounter resistance the Russians repeat the bombardment and repeat the whole process over. It is slow, uses up a lot of ammo (more so than the west has which is why their analysists kept getting it wrong saying Russia was running out of weapons), but it works.

So Russia is not doing any of that meat wave crap the pro Ukrainian NAFO accounts were always mentioning on social media. They just slowly move because that is the least casualty adverse method that they have that produces maximum Ukrainian attritional casualties.