With unique access, the Sky Original "Klitschko: The Hardest Fight" tells the story of former heavyweight boxing world champion Vitali Klitschko and his brother Wladimir, who together dominated their sport for more than a decade. Today, Vitali is the longest-serving mayor of Kiev and the feature-length documentary traces his journey from the ring to political office, where he has led the defence of Kiev since the Russian invasion of Ukraine in February 2022.