How many movies have Nikita Efremov and Rostislav Khait collaborated on?

They have worked on 4 movies together! Their first movie together was Ivan Tsarevich & the Grey Wolf (2011) while their highest rated movie together was Ivan Tsarevich & the Grey Wolf 3 (2016). They have not worked together since Ivan Tsarevich & the Grey Wolf 5 (2022). They are most known for their animation films together.