Bondarchuk’s War and Peace is amazing.
Battleship Potemkin is amazing.
Strike is amazing (but too long).
I always fall asleep during Ivan the Terrible but it’s also amazing.
Alexander Nevsky is amazing. Tarkovsky also always puts me to sleep. I love Parajanov but like Tarkovsky he was an anti-Soviet dissident (Shadows of Forgotten Ancestors is fantastic and his most accessible film).
А зори здесь тихие( The Dawns Here Are Quiet ) was one I really enjoyed, although it's paternalistic. Also it's a war movie so probably not what you are looking for.