British MOD claims "33,000" Russian casualties (KIA, WIA, MIA) so far in the war 6/29.
4,010 Russian KIA confirmed by BBC RU
plus minimum 2,800 KIA reported by DRP/LRP.
Minimum 7,000 KIA. Given that DRP/LRP losses have been similar to Russian army ones and don't include May-June losses, I would give a min. figure of 8000 KIA.
So the casualty range is 32,000-48,000 KIA/WIA/MIA. Russian MIA/POW is very low, perhaps around 400 after the recent prisoner exchanges.
Surprisingly, the British military figure falls in this range. Prior to this they had completely unrealistic Russian death estimates, likely taken from Ukrainian propaganda.