Vladimir Putin’s nemesis Alexei Navalny has posted on social media for the first time since a nerve agent attack left him critically ill last month. On Instagram, the Russian opposition leader posted a photo from his hospital bed Tuesday morning and addressed his supporters four weeks after he was poisoned after drinking a cup of tea at a Russian airport. “Hi, this is Navalny,” he wrote. “I miss you. I still can hardly do anything, but yesterday I was able to breathe on my own all day... I did not use any outside help, not even the simplest valve in my throat. I liked it very much.” The poison that struck down Navalny has been identified as Novichok—a nerve agent concocted by Soviet scientists during the Cold War. Navalny’s second-in-command told The Daily Beast last week that she suspects her boss was attacked by men sent by close Putin ally Yevgeny Prigozhin.