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Joined ISIS via Turkey and passed info on six

The Russian spy beheaded by ISIS was an orphan who was recruited by secret service and sent to Syria after being caught with drugs, MailOnline can reveal.

Magomed Khasiev confessed on video to being recruited by Russian intelligence before going to Syria and working undercover for the Federal Security Service (FSB).

The brutal execution was carried out by a Russian-speaking terrorist who addressed President Vladimir Putin directly and vowed to unleash murderous attacks on Moscow.

Undercover: Magomed Khasiev, pictured, confessed to being recruited by Russian intelligence before going to Syria and working undercover for the FSB on a video of his murder which was released by ISIS

Gruesome: The video showed a Russian-speaking terrorist killing Khasiev, a fellow Muslim who was orphaned

Now, MailOnline can reveal Khasiev was born in Chelyabinsk, in the Russian Urals mountains but orphaned aged nine and raised by adoptive parents in Chechnya.

The following year he became a Muslim and went on to study law at Maykop Polytechnic college, in the small Russian region of Adygea.

Khasiev, born Yevgeny Yudin before taking the name of his adoptive mother, is said to have ended up in Syria after being recruited by Russia's Federal Security Service, the FSB.

In February last year he was caught in possession of prescription medication, lyrica pills, and was known to have links to drug dealers. Khasiev is said to have done a deal with the FSB to avoid prosecution, it is claimed.

He was then sent to ISIS via Turkey and given the intelligence services information from behind enemy lines.

Anton Naumlyuk, a journalist from Radio Svoboda, said: 'In summer 2014 (he) was caught by FSB people having drugs on him.'

'Khasiev was sent to ISIS via Turkey. From there he was in touch with the FSB and passed information about those who were intended to go to Syria - and who had already got there,' said Naumlyuk on Facebook.

'The last time he passed information about a student of a medical college.'

Russian: Khasiev was raised by his adoptive parents and studied law at Maykop Polytechnic college, in the small south Russian region of Adygea

Loyalty: But Khasiev wanted to be Chechen, and was filmed appealing to its leader to be allowed to live there

Spy: He was recruited by the Russian secret service in summer 2014, and was sent to Turkey, and then Syria

It is thought Khasiev was suspected of being a spy by ISIS after Russian medical students were arrested and convicted for assisting ISIS.

On his execution video, Khasiev looked into the camera and said: 'During all this time I contacted FSB of Russia five times and passed information about six brothers.

Dangerous: While in Syria he passed information to on six people to the FSB

'And when I contacted FSB the last time, I passed information about brother (name is bleeped out) who studied in a medical institute.

'During the last contact, Shamil [the fixer] told me to wait. And I understood that I had to wait for further instructions.

'But I couldn't wait or pass information any further because I was caught and completely exposed by officials of the security service of the caliphate.'

The beheading is believed to have been in Raqqa, ISIS de facto capital.

The city has come under heavy Russian bombardment in recent weeks and is now a target for UK air strikes.

As Khasiev knelt beside a lake, his ISIS executioner, spoke in a Russian: 'Here today, on this blessed land, the battle [against Russia] begins.'

'We shall kill your children for every child you've killed here.'

He warned Russia of defeat as humiliating as its 1989 retreat from Afghanistan, which prior to the collapse of the USSR.

'We shall kill your children for every child you've killed here. And we will destroy your homes for each home you destroyed here,' the fanatic went on.

The FSB has not yet commented on the claims - although a Russian intelligence source said ISIS has offered no evidence Khasiev was an FSB spy.

'Most probably, the executed man had nothing to do with our intelligence. A few factors prove that,' the source told Interfax.

Warning: The Russian ISIS executioner told Putin: 'We shall kill your children for every child you've killed here'

'If the militants had really found a spy, they 'undoubtedly' would have used him as a negotiating pawn.

'It would have been more beneficial than simply killing him,' they added.

Pro-Kremlin site LifeNews today claimed Khasiev had been put on Russia's federal wanted list in February this year for 'participating in military actions on ISIS side'.

In May, a criminal case was filed against him in absentia for 'participating in an armed group on the territory of a foreign state' contrary to the interests of the Russian state.

Meanwhile Ramzan Kadyrov, a close ally of Putin, has vowed to avenge the execution.

The Chechen leader said: 'Yes he is a Russian citizen, a Chechen, and he was beheaded.