Ukraine

"the Russians no longer have a sergeant corps or junior officers with experience. That is, those who get to the front after shortened courses either become disabled or die very quickly. The Russians do not gain experience, they do not become more professional."

He also says the areas that stay off the front lines, such as artillery and drone pilots and electronic warfare, are improving, but we know that to win (at least without chemical, biological or nuclear warfare) the Russians will need frontline infantry to press the attack and hold territory. The question then becomes whether Russia can continue to find enough bodies to throw into the meat grinder.