No its not really a good idea. Russians like low humidity with higher temps. Box turtles like humidity up in the 80's. Also diseases would be the most scariest thing. Russians can give the box turtle a disease theat the box turlte wont be able to fight off since they nver encounter it. Vise versa the other way around. If you do house them together its very likly that one or the other will die or get very sick. Best thing is just dont do it.