Russia isn’t much of a threat outside of its own railway system. The soviets build their military logistics around rail as the primary mode of transport. This is why UA being able to hit the exit rail depots where RU was massing equipment was so effective at stopping the RU advance (coupled with UA’s innovative use of drones to attack road-based supply lines).

NATO makes use of rail, but also has LOTS of varied mobility for delivery of logistics.

In this way, NATO can shut down an invasion by RU by attacking the rail system, with both conventional and cyber weapons.

The only counterexamples I can find are where the RU contractors do large scale ware for junta/warlords like in Syria and multiple countries in the Sahara. But they aren’t fighting a large modern army there — mostly insurgencies and militias.