The viral video clip showed a well-known TV presenter announcing the alarming news that French president Emmanuel Macron had cancelled a planned trip to Kyiv because of an assassination plot. The Élysée and the TV station concerned, France 24, quickly debunked the video as fake and AI-generated. But they were not able to contain its spread, particularly after former Russian president Dmitry Medvedev reposted the video, describing Macron as “scared of a real, or presumed assassination”. Officials in Brussels and other European capitals are warning that more vigilance and tougher penalties for online platforms will be needed to counter Russia’s...