Man I hate that Ukrainians have to grind this war like a battlepass achievement, to unlock new weaponry. Had they had planes last year russians wouldn't have had the time to dug in
Likely around 8k-10k in total. So they're likely over 50% attrition on their primary means of warfare.
And keep in mind this is artillery destroyed; they will also have lost a lot of artillery through wear&tear, and have used up artillery pieces as spares for other artillery pieces. Plus they still need sizable reserves for the defense of their massive country.
Russian military is moving towards complete ruin with the war in Ukraine.