Yes and another thing to be remembered is that for Russian (and 3rd party) soldiers, this is just a job. But Ukrainians are fighting for their lives and their country.
It's not a perfect analogy but is similar to what we faced in Vietnam. American officers were being fragged by their own troops because the feeling amongst some grunts was that the cause really wasn't worth it.
The NVA didn't have those feelings, it was life or death for them, too, and there was no other place to go home to after a tour of duty.
Putin needs more ragtag troops because his military has been found out to be mediocre and he lacks sufficient high tech weaponry and funding. So, more cannon fodder, please, and I'd expect a pretty high number of desertions from Vlad's army.