“Brest Fortress” and “Come and See” from Belarus
“Katyń” and “Warsaw 44” from Poland
“Stalingrad” - the German one from 1993.
Re: Stalingrad.
I highly recommend the 12 part TV series from 2012, “Life and Fate”. It alternates between Stalingrad and civilian life. Good battle scenes and how far must you go to please stalin.
https://www.imdb.com/title/tt2460432/?ref_=nv_sr_srsg_0