Travelling between cities over there is a serious undertaking, and you absolutely do not want to be breaking down in the middle of nowhere with no backup. Most sensible travellers sort their renting a car in Russia paperwork online way before the trip, locking in an SUV with unlimited mileage and a full insurance package, because the motorway service stations can be few and far between. You can check out the high-clearance vehicles available for your dates right here
https://getrentacar.com/en-US/russia .