You can, but you shouldn't need to. Russians don't need as much heat as many tortoises. They should have a basking spot at 90-100F, and a cool end in the low 70s and it should drop to the low 60s or upper 50s at night. What kind of substrate are you using? What temps do you have now?
Unless it drops below 58 in his enclosure, he doesn't need it, if it does you could use a black or red bulb for heat or a CHE. The heat mat should work fine too.
It doesn't sound like you necessarily need it. Russians can really cool off at night as Spn785 mentions, and they may actually be more active when they do this.
They just need to be able to warm up under a nice basking/uv area in the am and during the day.