Why can Aleksandr Pushkin’s poetry be difficult to translate?

Aleksandr Pushkin’s poetry is often considered difficult to translate because his verse relies heavily on his perfect control of form, tone, and language.1

Pushkin was a deeply playful and experimental writer who frequently adopted a vast array of conflicting masks and personae. His work shifts fluidly between serious themes and irony—sometimes even employing irony at his own irony—which creates a complex layering of meaning that is challenging to capture in another language. Furthermore, as a master parodist, he utilized a dazzling range of tones and self-conscious digressions, particularly in works like Eugene Onegin, which are integral to the brilliance of his writing but difficult to replicate through translation.1