If you want good 6mm Modern Russian Infantry, then GHQ is probably your best, and likely only bet.
The quality of GHQ items all round is undoubtedly the best you will ever find on the market.
I have some of their T72s with ERA and my god, they are more detailed then half the 15mm and even 20mm kit on the market.
Of course there are limitations on the figures, but they are excellent and you can identify quite easily what weapons they are operating.