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ISIS releases video purportedly showing beheading of alleged Russian spy

ISIS claims it has beheaded an alleged Russian spy in a killing at the hands of a Russian jihadi.

ISIS claims it has beheaded an alleged Russian spy in a killing at the hands of a Russian jihadi.

In a video released by the terror group Wednesday, an unidentified captive is seen kneeling in front of another man clutching a knife, according to Flashpoint Intelligence, a global security firm and NBC News consultant. The video is titled, "You Shall be Disappointed and Humiliated O Russians."

The captor, who is not masked, speaks in what sounds to be Russian before cutting the prisoner's throat.

The grisly execution would appear to be the first video of a Russian captive being beheaded, and comes on the heels of a Russian bombing campaign in Syria meant to root out ISIS. Russian President Vladimir Putin vowed to retaliate against the terrorists after they claimed responsibility for the downing of a commercial jetliner over Egypt on Oct. 31.

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The video also follows the likely death of ISIS terrorist Mohammed Emwazi, known as "Jihadi John." He is believed to have been one of two people "incinerated" in a U.S. airstrike last month on the ISIS stronghold city of Raqqa.

The U.S. and France have stepped up anti-ISIS airstrikes as well after a series of attacks in Paris on Nov. 13 that claimed 130 lives. ISIS said it was responsible for the coordinated carnage. 

This article originally appeared on NBCNews.com.