This is a rough estimate based on various sources I follow.
I actually forgot to mention the locally recruited Russian militia forces fighting for their homes.
Super interesting article you linked to re Afghan commandos. https://www.worldpoliticsreview.com/russia-afghanistan-taliban-us-afghan-commandos-ukraine-war/
From my perspective its far better they fight for Russia than for Iran or terrorist groups. The disaster of the US rout in Afghanistan continues to reverberate.
I agree that NATO stockpiles are dangerously depleted and will continue to deplete unless the EU and US move their economies to a war footing. Also, I'm not sure how much NATO can surge its armaments production given that most of the US civilian manufacturing has been outsourced to China and the EU is suffering massive energy and raw material shortages and price inflation.