As an apparent reaction to recent Russian military incursions in Syria, the Islamic State (ISIS/ISIL/IS) has released a graphic video promising attacks in Russia “soon, very soon,” while threatening to make their wives concubines and their children ISIS slaves.

The five-minute video runs gruesome footage of decapitations and Russian soldiers as an eerie chant of male voices is heard in the background. Subtitles of the chant’s lyrics have been posted, which declare that “the lions of Ummah have awoken” and soon Russian blood “will spill like an ocean.”

The video bears the logo of the Al-Hayat Media Center, the Islamic State’s foreign language media division, which has produced a series of similar videos documenting ISIS atrocities and threatening different targets in the West.

“We came to you with slaughter, defying death. In your gun barrel we have seen paradise,” the subtitles read. “Europe is shaking, Russia is dying. The Kremlin will be ours,” they chant.

According to Kremlin spokesman Dmitry Peskov, Russian security agencies will look into the video.

“I do not know the authenticity of this video, I do not know the authenticity of these sources, but in any case no doubt this will be material for review by our special (security) services,” Peskov said.

Some have speculated that the video’s release was intentionally scheduled to distract international attention from the losses the Islamic State is suffering on the battlefield in Iraq.

The Islamic State claimed responsibility for planting a bomb and bringing down a Russian passenger jet that crashed in Egypt’s Sinai Peninsula two weeks ago, killing 224 people.

“Prove that we didn’t bring it down, and how it came down. We will detail how it came down at the time of our choosing,” the group said in an audio statement posted online.

Western intelligence has named ISIS leader Abu Osama al-Masri as the chief suspect behind the plot.

The jihadist group also swore revenge after Russia began a campaign of airstrikes on ISIS strongholds in Syria six weeks ago.

Follow Thomas D. Williams on Twitter @tdwilliamsrome.