Concerning russians:
I have that particular size of vision cage and I've had russians for several years now. I've never tried to keep a russian in that cage, though. I keep them outside about 7 months, hibernate them 3 months, and maybe a couple months in tubs.
A russian tort isn't going to be happy unless he has something to dig into. I'd think you could put an inch or so of sand/soil mix, or some kind of bark mulch, etc in there. Maybe a thin layer in front by the sliding doors and a few inches in back where the tort could burrow in.
The biggest problem with the particular model of cage I have (sorry, it's been so long I don't recall the #) is lighting. I had to cut a hole in the top of the cage to pass a cord for a fluorescent light fixture, which I had to install on the inside of the cage. Otherwise I'd have to depend on just the basking light. These cages area really designed for snakes it seems.
It's only 7 sq ft of floor space, so as your tort grows you'll have to work to keep him happy in that small area. You should try to include things for him to crawl over and under, so that it's not just one flat space, but an area with levels. A playground and not just an empty field.
So if you can overcome the lighting problem and make a stimulating environment, your tort should be OK. A wild caught russian may have some trouble adjusting to the limited space, but a CB juvenile would be OK growing up in there.
Still, a larger enclosure, especially outdoors, would be even better.
Good luck!