But because group chats and the channel features are not end-to-end encrypted, Galperin said user privacy is potentially under threat. In February 2014, the Ukrainian people ousted pro-Russian president Viktor Yanukovych, prompting Russia to invade and annex the Crimean peninsula. By the start of April, Pavel Durov had given his notice, with TechCrunch saying at the time that the CEO had resisted pressure to suppress pages criticizing the Russian government. Telegram was founded in 2013 by two Russian brothers, Nikolai and Pavel Durov. In the United States, Telegram's lower public profile has helped it mostly avoid high level scrutiny from Congress, but it has not gone unnoticed. Some privacy experts say Telegram is not secure enough
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