Since it launched in 2011, WeChat has become China's most popular mobile social media platform.
According to information posted on Russian telecoms watchdog Roskomnadzor on Friday, the regulator had listed WeChat among the prohibited websites in Russia.
It is unclear how many users WeChat has in Russian Federation.
"Tencent is aware of the move and communicating with Russian authorities over the matter", a brief statement from the Shenzhen-based company said.
The huge success has helped boost Tencent's market capitalisation to more than US$300 billion, making it the most valuable Chinese company by market capitalization and putting it on par with Apple and Google-parent Alphabet.
Vadim Ampelonskiy, spokesman for the Roskomnadzor watchdog, said on Saturday (May 6) WeChat was blocked because it did not provide contact details for Russia's register of "organisers of information distribution on the internet".
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China also has strict internet regulations.
Last year, Russian Federation blocked popular professional networking site LinkedIn as it allegedly failed to comply with the rules.
Tencent says it has around 900-million users worldwide.
The announcement, which was released May 5, cites article 15.4 of the law, which instructs sanctions for failing to release the responsibilities of coordinators of online information dissemination.