hi wayne, which aircraft are you doing? Apart from the lifecolour paints theres not really any specific soviet colours in any of the main paint manufacturers ranges. It basically comes down to what looks about right, heres a few I have used --for the undersides
Tamiya XF 23 , top sides (on the 2 tone grey scheme)
Tamiya XF 19 and XF 54 . For the black and green top scheme , XF 69 Nato black , and either XF 5 or XF 67 for the green. If its a lavochkin youre doing then the interior was in a light blue , slightly brighter than XF 23 , more like rlm 65 hellblau , and the undercarriage bays and legs were in a greenish grey ,
Tamiya XF12 being ok for this. Heres a link to a chart which might help table of colors hope this helps , cheers tony