Vitali and Wladimir Klitschko: From the boxing ring to Ukraine's war

Vitali Klitschko was only a year into his retirement from boxing when he was elected mayor of Ukrainian capital Kyiv in 2014.

Eight years later, the former heavyweight champion found himself desperately trying to hold his city together as Russia invaded the country.
A new documentary follows Klitschko, together with younger brother and fellow boxer Wladimir, as he uses his fame to campaign for military support and raise funding in the face of Russian aggression.