Putin’s army has been fighting only in the third world for a generation - coming up against first world weapons and tactics has to be a shock.
Actually two generations if you include Putin’s Generals who fought in the Soviet War in Afghanistan.
Rea “Crimea” by Orlando Figes. It talks about the 1850s Crimean war. What is amazing is that the Russians then had the same problems, same errors etc.
It’s like they never learnt in 150 years