Pavel Durov, the billionaire founder and CEO of the Telegram messaging app, has repeatedly run into trouble with both the Kremlin and Western officials as he cast himself as a champion of free speech. Russia’s Federal Security Service accuses him of aiding what it called terrorist activities. It also said it was adding Durov’s name to international wanted lists. The Russian-born Durov, 41, responded by posting a photo of himself raising a middle finger on Telegram’s official account on X. The case marks an escalation of the Kremlin’s efforts to tighten control over the internet and digital communications amid growing public fatigue with the 4-year-old war in Ukraine and its growing economic fallout.