ISIS releases chilling video threatening to attack Russia...

The Islamic State has released a chilling video warning of attacks in Russia 'very soon' and threatening to 'make their wives concubines and their children slaves'.

The footage, posted by the group's notorious propaganda wing, also included chants of 'the blood will spill like an ocean' while showing horrific images of be-headings and scenes of Russian troops.

ISIS has previously called for attacks on Russia and the United States in revenge for air strikes on its fighters in Syria. 

Western intelligence officials also suspect the ultra-hardline Sunni group of planting a bomb in a Russian passenger jet which crashed in Egypt's Sinai Peninsula two weeks ago killing 224 people.

It warns: 'The lions of Ummah have awoken. They have raised their swords.

'O, filthy kufr (infidels), you are not brave at all. The sounds of your voice has been silenced.

'We will take through battle the lands of yours we wish, so much of your lands.

'Soon very soon, the blood will spill like an ocean... we will make your wives concubines and make your children our slaves.'

The video come nearly two weeks after ISIS affiliate Sinai Province claimed it blew up the St Petersburg-bound Metrojet plane on October 31.

Moscow and Cairo both dismissed the initial claim it brought down the Airbus A-321, but ISIS again insisted last week they were responsible and promised to reveal how.

'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. 

Its secretive leader Abu Osama al-Masri, 42, has also been named by Western intelligence chiefs as the prime suspect behind the plot. 

The terror group had promised revenge after Russia began a campaign of air strikes in Syria six weeks ago, targeting ISIS strongholds as well as moderate rebels backed by the West who are fighting President Bashar Al Assad.

Government troops on Tuesday broke a siege imposed by ISIS on the northern military air base of Kweiras since 2013, marking the first major achievement by Assad's forces since Russia began its air strikes.

The Britain-based Syrian Observatory for Human Rights said the Kweiras battle had left 60 ISIS fighters dead.

More than 40 government troops and pro-government gunmen, including Iranian and Hezbollah fighters, also died.