How many movies have Andrei Boltnev and Viktor Vatolin collaborated on?

They have worked on 4 movies together! Their first movie together was Загадки звёздного неба: Луна и месяц (1984) and was their highest rated movie together. They have not worked together since Загадки звёздного неба: Откуда взялись телескопы (1985). They are most known for their family films together.