The Islamic State jihadist group has threatened Russia in a purported video inciting extremists to stage attacks on the country.
In the nine-minute video, a masked man addresses Russia's president Vladimir Putin and urges IS supporters to carry out terrorist attacks.
"Listen Putin, we will come to Russia and will kill you at your homes … Oh Brothers, carry out Jihad and kill and fight them,” the speaker says.
It was not immediately possible to verify the authenticity of the video which was released on social media at the weekend.
Russia has been a staunch ally of Syria's president Bashar Assad in his government's more than five-year-long war with rebels and last year began air raids against IS in the Middle Eastern country.
IS has claimed a number of recent deadly terror attacks Europe, including the beading of a priest in France, a suicide bombing in Ansbach, Germany, last week, the 14 July truck massacre in the French city of Nice and the 22 March attacks in Brussels.
The radical Sunni group controls swathes of territory Syria and Iraq, where it has declared an Islamic 'caliphate'.
It has become notorious for its human rights atrocities, such as public beheadings including of westerners and has been outlawed by Russia, the US and many other countries worldwide.