"The information on web resources used by the Telegram company was sent to internet service providers on Monday in order to restrict access to them", read a message posted on the Roskomnadzor website.
There are some of you guys who might be familiar with the Telegram messaging app.
The Russian courts have recently ordered that the Telegram be blocked in the country.
The decision is effective immediately and will remain in force until Telegram developers provide the Russian Federal Security Service or FSB with an encryption key, she stated. The watchdog's chief, Aleksandr Zharov, told Russian media he plans on cutting off access to Telegram "soon".
In response to Friday's court ruling, Telegram's co-founder Pavel Durov tweeted: "Privacy is not for sale, and human rights should not be compromised out of fear or greed". Durov said earlier last week the the latest version would have "built-in" features that would avoid the ban.
Telegram, a free application that lets people exchange messages, stickers, photos and videos in groups of up to 5,000 people, has attracted more than 200 million users since its launch by Durov and his brother Nikolai in 2013. The ban followed a long-running battle between authorities and Telegram, which has a reputation for securely encrypted communications, as Moscow pushes to increase surveillance of internet activities.
The popular app is used by many around the world to communicate without the fear of being monitored by repressive governments. He has since been a vocal critic of the Kremlin's policies on Internet freedom.