Alesha Popovich and Tugarin the Serpent with English subtitles

Russian animated feature film, produced in 2004.

Alyosha Popovich (Russian: Алёша Попович, literally Alexey, son of the priest), is a folk hero in the Rus' folklore, a bogatyr (i.e., a medieval knight-errant). He is the youngest of the three main bogatyrs, the other two being Dobrynya Nikitich and Ilya Muromets. All three are represented together in Viktor Vasnetsov's famous painting Bogatyrs.
In Byliny (ballads) he is described as a clever-minded priest's son who wins by tricking and outsmarting his foes. He defeated the dragon Tugarin Zmeyevich by trickery.
https://youtu.be/8vPQKM5UOJU