If your russian tortoise is an adult, I can 100% gaurantee to you that it is not captive bred and you were decieved. If you bought it at a pet store, there are probably 3 pet stores in the world that might sell captive bred russian tortoise hatchlings, but they would be outrageously expensive.
Either way, a tortoise also does better outdoors, they just seem to be able to survive indoors better than a box turtle if you give them a ton of space and lots of expensive uvb lighting (each bulb runs 30-60 bucks, depending on the type you use, and each must be replaced every 6 months). My wife and I spend a few hundred bucks in lightbulbs each year just for ONE bearded dragon living in a large cage (8'x2'x2') indoors, and this cage would be too small, in my opinion, for a russian tortoise, one of the farthest roaming tortoises of the world, they survive because of their strong instinct to travel long distances constantly searching for food and mates.
If you can't keep this animal outdoors, get together a few hundred bucks and build a 4'x8' turtle table and set it up with the lights it needs. Perhaps it will do okay.
If you purchased a box turtle with no ability to keep it outdoors, you've made a grave error. Grave for the turtle. I know now of two keepers who have success keeping their box turtles indoors. Each has invested many hundreds of dollars and almost as many hours in building a zoo exhibit to house them, with plumbing, lights, weather, plants, etc. taking up a large part of the people's homes. I suppose this will be unfortunate for the turtle, but a good lesson for you that buying animals because they look neat without first researching their needs is a bad idea. If there's one thing that is repeated over and over again by the experienced keepers on this forum, it's that one rule.
If you are willing to spend the fortune to make a zoo exhibit for your box turtle, after spending a lot to set up your russian tortoise (they'll need to be in separate rooms most likely since the boxie needs high humidity and the russian needs the opposite), there is a canadian who posts on this forum, named kanuck I believe, who I think would be the best person to talk to IN DEPTH about every detail of his work to set up his indoor environment.