Telegram's network experienced outage after it was flooded with overwhelming traffic.
Roskomnadzor's head, Alexander Zharov, said in a letter published on the regulator's website that time was running out for Telegram to provide the necessary information.
Telegram founder Pavel Durov revealed that the massive cyber attack on the encryption-based service was launched by China.
In a tweet response, Durov wrote that the IP addresses originated mostly from China. He further added that all state actor-sized DDoS attack coincided in time with protests in Hong Kong.
The revelation comes a day after Telegram's network experienced outage after it was flooded with overwhelming traffic.
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