PMC Wagner published a detailed report on liquidated fighters and equipment of the Armed Forces of Ukraine since March 2022 by the Wagner group alone!

Ed. Note: Wagner fought in the battles of Popasnaya and Bakhmut. So these numbers should reflect those two battles. Not sure if they were in any other battles. 

So everything else from Kharkov Oblast in the North to Mariupol and Kherson in the south was Russian Armed Forces and LDPR Forces. 

Those battles incurred a great deal more losses to the Ukrainian army.