Supporters on Friday created an event page for January 15, the day President Vladimir Putin's biggest critic Alexei Navalny will hear his verdict in a controversial embezzlement case which could see him sent him to prison for up to 10 years.

Russia's Internet watchdog Roskomnadzor said Sunday that the page has been blocked on orders of the general prosecutor.

The prosecutor "demanded to limit access to a number of resources calling for an unsanctioned mass event, including social networking groups. The demand has been fulfilled," RIA-Novosti news agency quoted spokesman Vadim Ampelonsky as saying.

The Facebook event, called "Public gathering to discuss the verdict", had over 12,000 people signed up at the time it was blocked, and now opens only through a non-Russian IP and only for non-Russian users.

Navalny, whose leadership role in the opposition was built up over the years via his popular anti-corruption blog and carefully-managed Internet campaigns, criticised the social networking giant for quickly bending under Kremlin's pressure.