The Russian pilots especially, must know about these modern western weapons systems flowing into Ukraine and must dread them, as do tank crews. They have all see YouTube videos of them on the internet and know they are dead in a million different ways in the war zone. It's really has just begun, there is all kinds of shit flowing into Ukraine, probably anti ship missiles too. Ukrainians are under going a mass education program for a lot of different jobs, from shooting missiles, to using small arms and modern tactics, they have weeks more to prepare.