The Region 2 UK two disc release is the one to get with Russian DTS 5.1 and Dolby Digital 5.1 (and no annoying English dub). The second disc has:
A Region 2 UK single disc edition is also available.
The Region 1 US release and US Region free Blu-ray include similar extras (except the trailers) but have the original Russian audio in only Dolby Digital 2.0 at 256 Kbps while the (awful) English dub gets Dolby Digital 5.1 at 448 Kbps. Go figure. At least Region 4 gets the 5.1 Russian, but clearly the Region 2 is superior based on audio choices and extras.