Russia said it had designated Telegram founder Pavel Durov a “terrorist” and “extremist,” further tightening the screws on the popular messenger app ahead of parliamentary elections in September.

Russia’s main domestic security agency says the founder of the messaging app Telegram has been charged with aiding terrorism and put on an international wanted list.

Russia's Federal Security Service (FSB) has announced that Telegram founder Pavel Durov is accused of facilitating terrorist activity and has been placed on an international…