The mayors of several European capitals have been duped into holding video calls with a deepfake of their counterpart in Kyiv, Vitali Klitschko. The mayor of Berlin, Franziska Giffey, took part in a scheduled call on the Webex video conferencing platform on Friday with a person she said looked and sounded like Klitschko. “There were no signs that the video conference call wasn’t being held with a...