These are Strelets WW1 Russian infantry in summer dress, painted as standard Imperial infantry suitable for 1917 onwards. The high proportion of Adrian helmets in the Strelets set suggests grenadiers or assault infantry, but I assume they become more the norm in better equipped units as the civil war progressed.
The whole unit.
The officer, perhaps a little out of date waving his sword, but it helps pick him out on the tabletop.
Next up, similar figures painted up as Kornilovsky. Those figures in caps have a black band with red cap piped in white, to add a bit of colour. All wear black trousers coupled with the normal uniform tunic.
Finally, these are HAT figures, so all wear caps, painted up as a "coloured unit", the Drozdovsky. I think these are also known as the "Chaffinches" colloquially. These have white cap bands and red caps, off white tunics and blue trousers.
I have some more units in preparation, more on them later. These are also available for Andreivia.
As ever, thanks for looking.