Kiev Mayor Vitali Klitschko issued a demand for clarification after a slew of deep fake videos fooled mayors in Vienna, Berlin and Madrid into thinking they were talking with him. “This is criminal energy. It must be urgently investigated who is behind it,” Klitschko said in a video shared by Germany’s Bild newspaper on Saturday. “Deep fakes” can take the form of technically sophisticated videos that appear to realistically depict the speech and actions of a person in real life. “Several mayors in Europe have been contacted by a fake Klitschko who has said absurd things,” Klitschko said, addin…