How many movies have Nikolai Cherkasov and Serafima Birman acted in together?

They have worked on 4 movies together! Their first movie together was Friends (1939) while their highest rated movie together was Ivan the Terrible, Part II: The Boyars' Plot (1958). They have not worked together since Ivan the Terrible, Part II: The Boyars' Plot (1958). They are most known for their drama films together.