Not that it helps anything, but here are my guestimations for losses based on the fighting and casualties reported by the Armed forces of Russia on their side.
I remember some time in mid March Russia reported 498 dead soldiers, I assume not including Separatist losses which given their relatively small proportion of the invasion force but lower quality equipment, lets add another 150-200 or so as a reasonable guess.
I have no access to any special info, none of this is real and just speculation on my part, losses for either side could be much higher or much lower, but I tried to be fair enough in my guessing and not exaggerate in any way that feels like Keev Dependent or Vatnik Today.
Now the Ukrainians are not reporting their losses at all really, at least not in any realistic way so i assume they are higher than the Russians, especially given the huge firepower advantages the Russians have.
Losses for the Armed Forces of the Russian Federation by my estimate are anywhere between 1,2000 and 4,000 killed, 8,000-10,000 wounded, missing and with POW"s somewhere in the hundreds.
DPR/LPR losses likely at about 1,000-1,500 killed and 4,000 wounded, because though they are a much smaller part of the Russian force they seem to take an active role in the fighting and their equipment is generally poorer then Russian regulars, with some being as well equipped as regular Russian Army with Ratnik Armor and AK-74M's but most being on the level of 1970's Soviet Soldiers in terms of gear with plenty of AK-74's, SSH-68 Sfera helmets and AKM pattern rifles, with even some rear line milita brandishing WW2 era firearms.
Ukrainian losses (INCLUDING Foreign forces) could be the range of 8,000-10,000 killed (possibly much higher but I'm trying not to Putler shill too hard and I'm lowballing it intentionally) 16,000 wounded or missing, with POW's likely being much higher then Russia at about 4,000-6,000 (again, including any person fighting under the Ukrainian banner so foreign fighters as well). Judging from what my good Belarus friend on the ground in the Russian Army has said, it is likely that several thousand Ukrainian soldiers have defected to the Russian side, let's say between 3,000 and 4,000.
Let me know if you guys think this sounds reasonable or realistic or not.