As far as I know, only Mil 8's are operating on Sakhalin, or at least thats all that was there when I last visited last year.
Sikorsky are indeed churning out a new S-76.
Heard whispers that on Sakhalin the Mil 8's are being replaced by either S-92 or AB 139, last I heard the 139 was favoured.. if thats any use???