This isn't new for Russian Army. You win wars with staying power and quick adaptation.
The funiest millitary book I have ever read was Decision in the Ukraine written form the Western (German) perspective... It is basically accusing Russian army of not fighting "fair" - digging with defense in depth, using well places artillery and minefields to blunt the offensive of elite German SS Panzer corps.
Russia Against Napoleon is also well worth reading to realize to what lengths Russia can go to win the war... This small Russian, hungry army in rags in Lower Silesia in 1813 who still had the spirit to carry the war to Paris by 1814...
The funiest millitary book I have ever read was Decision in the Ukraine written form the Western (German) perspective... It is basically accusing Russian army of not fighting "fair" - digging with defense in depth, using well places artillery and minefields to blunt the offensive of elite German SS Panzer corps.
Russia Against Napoleon is also well worth reading to realize to what lengths Russia can go to win the war... This small Russian, hungry army in rags in Lower Silesia in 1813 who still had the spirit to carry the war to Paris by 1814...
https://www.amazon.com/Decision-Ukraine-Operations-Stackpole...
https://www.amazon.com/Russia-Against-Napoleon-Story-Campaig...