Another nice feature of nowadays Russian armour is the different camouflages even within the same units.
The paints I refer in the next paragraphs are just the ones I use and not mandatory.
After some reading about Russian camouflages you can settle with this:
As base colours, they have two different shades of green, one lighter olive ( Citadel Loren Forest) and another darker (Vallejo 114 Russian Green, yes, yes, aviation colour).
As camouflage colours you can find two tones of yellow sand ( Vallejo 819 Iraqi Sand and Citadel Tausept Ochre), brown (Citadel Mournfang Brown), black (whatever you have), grey ( Vallejo Light grey and (more recently) orange (Citadel Macharius Solar Orange).
For better results I advise the excellent Mig paints specially designed for these conflicts.