After Tesla CEO Elon Musk challenged Russian President Vladimir Putin to single combat, Russian space agency Roscosmos' head Dmitry Rogozin replied with a verse by Alexander Pushkin calling Musk a "little devil". Quoting the poet, Rogozin wrote, "You, little devil, are still young. You're weak to compete with me; it'd only be a waste of time. Overtake my brother first."