Christo Grozev on Twitter: "In the call, you hear the Ukraine-based FSB officer ask his boss if he can talk via the secure Era system. The boss says Era is not working. Era is a super expensive cryptophone system that @mod_russia introduced in 2021 with great fanfare. It guaranteed work "in all conditions" https://t.co/MlIt8NNwLE" / Twitter
https://twitter.com/christogrozev/status/1500973926436020226