The Institute of History of Ukraine in its online encyclopedia (in Ukrainian) explains that the vertep, a telling of the Christmas story through puppet theatre, is thought to have appeared in the second half of the 17th century and lasted until the early 20th century. In 1929, I︠E︡vhen Markovsʹkyĭ published a book about vertep which was due to be the first volume of a set but which was never added to. The UL’s copy has its record here.
The front cover of the book, with two pages showing puppets and a stage.
The vertep stage was often a two-storey house, with the story of the nativity taking place on the higher floor while the other provided other religious or secular puppet plays, with a strong strain of comedy running through the secular plays. The Museum of Theatre, Music, and Cinema of Ukraine shows a beautiful array of vertep houses on this page.
Secular stories involved stock characters, among which often featured a Ukrainian peasant couple, a Zaporozhian Cossack, clerics, a Jewish character, a Polish character, Russian soldiers, and various animals.