In English, it's called Carol of the Bells, and has become a regular part of the December soundscape.
But the Ukrainian original—like folk carols all over Europe—although sung at Christmas, doesn't have anything to do with Christmas.
Instead, it's about spring.
Which is to say: it's thoroughly pagan, through and through. Because to pagans, Yule isn't just a self-referential blaze that sits in its own golden halo at the end of the year; it's the first spark of what comes next, a collective turning towards spring, and the growing season to come.