The ruling came a month after telegram lost a lawsuit it filed against Russia's secretive security agency, the FSB, which has said Telegram is the messenger of choice for "international terrorist organizations in Russia." In 2016, the Kremlin supported a sweeping anti-terrorism law that required authorities to be given backdoor access to encrypted applications. Telegram, which says it has 200 million users, is widely used by lawyers, reporters, government officials, and others. The FSB says telegram was also used by a suicide bomber who last year killed 15 people on a subway in St. Petersburg.