>a few of the videos / articles / images I've seen of Russians fighters in Ukraine lead me to believe they don't feel this similar level of support from their armed forces,

I'd mostly agree with the russian opinion (from what I've seen), but i certaily haven't seen it regarding the Ukranians. r/combatfootage r/ukkranianwarvideoreport etc.. Quite the opposite. I'd guess being trained by the us and uk has had an effect. As an aside, whenever ukraine forces pass, they always wave to each other.