On April 16, 2018, Roskomnadzor ordered Russian ISPs to block access to the instant messenger Telegram, as the company refused to hand over the encryption keys for users' chats to Russian authorities.[25] The information watchdog applied the method of mass IP blocks, hitting the major hosting providers, such as Amazon, and disrupting hundreds of Russian internet services.[26][25][27] Roskomnadzor had to abandon this approach, but failed to implement any other means to stop Russian users from accessing Telegram.