I live in Missouri (St Louis) and have kept both box turtles and russians.
I've found it is relatively simple to keep either species outdoors from spring to fall. We are in the natural range of the box turtle, and as long as you provide appropriate shelter, boxies do well. Russians seem to tolerate the range of temperatures and humidity quite well, too, as long as you keep them out of cold AND wet.
Keeping them indoors is a little different. Russians seem to tolerate the desert-like conditions produced by central heating and air conditioning. With regular soaks and a humid hide spot they will thrive. Box turtles, on the other hand, have tended to withdraw into the substrate and become inactive, even when provided with humid substrate and wading pool.
Try www.russiantortoise.net for further info.