While that is true, when you actually want to move armour over long distances you actually load them on a train. Next best is a truck, granted, but a modern tank is really a bit too heavy for that to be your primary choice.
You don't drive a tank (or other armoured vehicle) if you can help it. The wear on the vehicle and the fuel consumption is out of this world. What an armoured unit actually does all the time is maintenance, maintenance, and more maintenance. In fact, being at war doesn't change the maintenance requirements that much, as in; they're constantly high all the time, whether someone is shooting at you or not.
Of course, the Russians already have a rail road to Vladivostok, so while a road wouldn't hurt, it'd be an extremely poor choice for moving armour from Europe to eastern Siberia. You'd have to have supply and maintenance depots every few miles just to keep the trucks carrying the tanks working. Tanks are just too damn heavy for anything but rail or sea transport.