Found this on wikipedia source links,
Between 4293 and 4515 KIA
Thanks for the info. Assuming this method of counting is 50% undercounting, we arrive at under 7000 in 4.5 months, or 1500 per month. These first few months are the most difficult for the Russians since they are
1. Dealing with Ukrainian troops that spent the last eight years entrenching.
2. Ukraine side had professional troops that still have a lot of fight left in them, at least up until Mariupol and Poposna.
3. The Ukrainian weapons have not been degraded as much as they are now.
The Ukrainian side is facing much more difficult problems.
1. Some estimate Ukrainian casualties at 200-300 dead per day. Even the Ukraine side first admitted to 100 per day and later said it was higher. Even an average of 150 per day since the beginning of the war put this at 20000, or three times the Russian casualties.
2. Since the Russians are rotating their troops and the losses are spread out more to different units, they are increasing their combat effectiveness. When the troops go through combat, their combat effectiveness increases, where as losing troops means they lose combat effectiveness. The problem with Ukraine is that they are not able to rotate their troops. This means entire units are taken out, losing their most battle hardened and well trained troops wholesale.
3. They are steadily losing more and more of their artillery, even as the West sent in more. They have lost most of their armor. This means they can only dig in and get bombarded. No maneuvering warfare for them. As the Russians are able to maneuver, things will get worse and worse if you stay in one place.
4. They have a huge desertion problem which will only get worse. I am sure there are some desertion on the Russian side, but nowhere near as bad, especially the new troops are volunteers and not dragged off the parking lot like the Ukrainian side.
5. They are losing their geographical advantage. Once Kramatorsk and Slovyansk are taken, all the frontline that they spent the last eight years building are gone. What is left are a few cities defended by inadequate number of troops and even fewer professional troops. On the Russian side, they have found a tried and true way to take a city. Once Donbass is taken and they straighten out their frontline, these cities will be surrounded by all sides and bombarded to submission. We will see how fast these big cities like Kharkiv fall, but I would not be surprised if they go pretty quickly.
Once the Russians finish with Donbass, and take the couple of big cities along the Dnipro, they will be able to sweep across Western Ukraine relatively unopposed. With mostly inexperienced troops and lack of equipment, the Ukraine side might take eight dead for every Russian one instead of the three to one for the last few months.