hi , sorry to say but russian green is not a colour you can match , i have photos of 100's of t 72 tanks parked up and there must be over 20 shades of green , it all depends on the paint maker and how it was mixed and more importantly with what , petrol , water, river water all make differenace , i remember what one of the masters of model making always quoteds and it still applies to this day , The light you paint is is not the light it is judged in . So please do not get hung up on colours , we all see them in different hues . cheers ian