Islamic State has released a video threatening attacks in Russia "very soon", the SITE monitoring group said on Thursday.
Al-Hayat Media Center, Islamic State's foreign language media division, released a Russian language video with chants of "Soon, very soon, the blood will spill like an ocean", SITE reported.
Islamic State has previously called for attacks on Russia and the United States in revenge for airstrikes on its fighters in Syria.
Western intelligence officials suspect the ultra-hardline Sunni group of planting a bomb in a Russian passenger airplane which crashed in Egypt's Sinai Peninsula two weeks ago.