"The result is on this photo: fiery 'greetings' to the invaders," the Security Service of Ukraine wrote alongside a photo showing several military vehicles among plumes of black smoke. In 2018, Russia banned Telegram although it reversed the prohibition two years later. Telegram was founded in 2013 by two Russian brothers, Nikolai and Pavel Durov. Such instructions could actually endanger people — citizens receive air strike warnings via smartphone alerts. Some privacy experts say Telegram is not secure enough
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