How many movies have Aleksandr Razin and Mikhail Yershov collaborated on?

They have worked on 4 movies together! Their first movie together was Blockade: The Luga Defense Line (1974) while their highest rated movie together was Blokada: Pulkovskiy meredian (1975). They have not worked together since The Siege: Operation "Iskra" (1977). They are most known for their history films together.