> Does anyone have opinions on Bernard Comrie's "Languages of the Soviet
> Union," or know better books on Russian languages that are not Russian?
> What I am really looking for is something that describes in some detail
> the language structures of the region.

For an overview, I suggest a paper by Gregory D. S. Anderson: "Towards a typology of the Siberian linguistic area"

Some other more specific typology papers from my collection that might also be useful—
Stefen Georg: Yeniseic Languages and the Siberian Linguistic Area

René Schiering & Harry van der Hulst: Word accent systems in the languages of Asia
(evidently actually a book chapter though I do not have the details at hand)