A 22-year-old man was hoodwinked by police into believing he had hired a contract killer to murder his wealthy parents and ten-year-old sister so he could immediately claim his inheritance.

Detectives found out about the sickening plot and staged the killing in the family home.

An officer played the role of the hired assassin in the Russian resort of Sochi, a host city for this year's FIFA World Cup.

The son had instructed the 'contract killer' in how and where his family should be murdered.

The man's mother and father - 'devastated' about their son's murderous intent - played dead in the police mock-up and photographs of them, with blood gushing from 'fatal' knife wounds, were taken

After seeing the pictures, the man expressed 'delight' and agreed to pay the promised £38,000 fee to the man he believed was a contract killer as soon as he had collected his inheritance. Pictured: His arrest by police

The 'assassin' arranged a meeting in a Mercedes and showed the photographs of his 'slain parents' to the man. He was immediately arrested, and quickly confessed

He even drew a floor plan, and indicated where security cameras were placed, and how to avoid guard dogs.

He agreed a fee with the undercover policeman for killing all three of his relatives.

He demanded to see pictures of his slain parents.

The man's mother and father - 'devastated' about their son's murderous intent - played dead in the police mock-up and photographs of them, with blood gushing from 'fatal' knife wounds, were taken.

The 'assassin' arranged a meeting in a Mercedes and showed the photographs of his 'slain parents' to the man.

No pictures were released of the man's sister and it is unclear if she took part in the police set-up.

After seeing the pictures, the man expressed 'delight' and agreed to pay the promised £38,000 fee to the man he believed was a contract killer as soon as he had collected his inheritance.

Instead the son - who has not been named - was detained by armed police as a police video shows.

He immediately confessed, according to police in Krasnodar region, who revealed that the son had twice plotted to kill them previously.

'He wanted to get rid of parents because they were not giving him money,' said a police source.

An officer played the role of the hired assassin in the Russian resort of Sochi (pictured), a host city for this year's FIFA World Cup

'Before looking for a killer he tried to get of his relatives twice.

'He looking on the internet to find out how to carry out the murders.

'The criminal wanted to put pills in the kettle to poison his parents but his father found out something was wrong.

'Then the son planned to break a thermometer in his parents' car so that they were poisoned with mercury vapours.

'But he got cold feet.'

During interrogation the young man said: 'I had been planning it for several months.

'I'm so done with them, they didn't understand me, so I found a contract killer.'

His parents 'cannot believe he could do this', said police.

His father runs a major education institution in Sochi.

The family have a large house and car as well as savings which would have gone to their son.

The man faces 15 years in jail if convicted of preparing the contract killings of his family.