How many movies have Alexandr Boyarsky and Mikhail Khrustalev collaborated on?

They have worked on 6 movies together! Their first movie together was How to Catch a Feather from the Firebird (2013) while their highest rated movie together was The Fortress: By Shield and Sword (2015). They have not worked together since Ivan Tsarevich & the Grey Wolf 4 (2019). They are most known for their animation films together.