One has to keep in mind the conditions the "non Russian" soldiers are operating under. In effect they don't have the logistical and tactical support they should have in normal open warfare.
There have been a few times where the Russian side had their @rses handed to them on a platter until the Ukrainian air cover was neutralized.
In effect it has made it into an old fashioned sh!t fight that has become a war of attrition. The problem is, the Russians have and unlimited trickle supply of personnel and weapons. The trick for the Russians is to keep it low level enough, that they can keep clandestine logistics running and the death toll at a manageable level.
Whilst the Ukrainians may have some volunteers, but no real supply of weapons and people. A limited supply of economic aid and unlimited supply of new uniforms and MRE's. Least they die with new uniforms and full bellys.
