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

Aleksandr Pushkin’s poetry is often considered difficult to translate because his verse relies heavily on a perfect, masterful control of form, tone, and language that is uniquely tied to the Russian tongue.1

His work is deeply playful and experimental, characterized by a complex use of irony—often including irony directed at his own previous ironic statements—and a vast array of conflicting masks and personae. Because he was a master parodist who frequently engaged in self-conscious subversions of literary conventions, much of the nuance, wit, and brilliance of his original structure is frequently lost when rendered into other languages.1

While his works have been translated into all major languages and are recognized for their ability to transcend national barriers, the specific linguistic precision and the "dazzling array of tones" he employed remain challenging to capture fully in translation.21