The safety of visitors to the Sochi Winter Olympics Games will be guaranteed, Russian National Anti- terrorist Committee (NAK) said Wednesday.

"Despite the calls by various gang leaders in the North Caucasus, all Russia's state institutions, special services and law enforcement bodies are constantly implementing a set of measures aimed at providing security for Russian citizens," the NAK said in a statement.

Thus the NAK responded to the video address uploaded to the internet on Wednesday by a Chechen warlord Doku Umarov, who has called on Islamist fighters to "compromise" the Sochi Olympics.

The NAK added that it would put a particular focus on large- scale international sports events to guarantee safety of their participants and visitors.

Umarov, who has been recognized as a terrorist both by Russia and the United States, urged the Islamist fighters not to allow the Winter Olympic Games to be held in Russia's Black Sea resort of Sochi in February 2014.

Earlier, Umarov claimed responsibility for several terror attacks in Russia, including suicide bombings in the Moscow subway in 2010 and at Domodedovo Airport in 2011.