What sort of support ratio do the Russian forces have. I've read that the US army has a "Tooth to Tail" ratio of 10 support troops to 1 on the battle line. There has to be an enormous truck pool to make those "last mile" deliveries of rockets, fuel, food, medical equipment etc. With the Russian troops allegedly taking heavy losses of numbers of frontline troops former support soldiers need to be sent up and the supply lines become harder to maintain. A prolonged war is not in Putin's best interests.