In his mayoral office, former heavyweight boxing champion Vitaly Klitschko waves a stylus pen at a screen on the wall - allowing him to monitor Kyiv's electricity grid and water supplies in case of a Russian cyber attack.
Klitschko, who has been mayor of Ukraine's capital city since 2014, is now readying its defences, inspecting Soviet era bomb shelters and encouraging citizens, including his brother and fellow heavyweight champion Wladimir, to become reservists.
