Ziyangareev had only just been released from prison for two rapes

An 'inhuman monster' who raped four women in a week told police he did nothing wrong and his victims 'should be grateful to him'.

Gizar Ziyangareev, 39, admitted the attacks - one of which left a 31-year-old woman in a coma after suffering a heart attack - but showed no remorse, Russian police have reportedly revealed.

Construction worker Ziyangareev was jailed for 23 years for the rapes, which happened in the western city of Ufa.

Gizar Ziyangareev admitted four rapes in the space of just one week in September last year

It is one of the longest sentences ever given to a rapist in Russia - but the mother of one of his victims has called for a return to the death penalty.

He had only just been released from prison, having previously raped a neighbour and an underage girl.

The rapist was caught after a brutal attack on Anna Barmina, who he assaulted with a knife and fists before dragging her into bushes and raping her with a broken tree branch.

Ziyangareev's 23 year sentence is one of the longest jail terms ever given in Russia for someone convicted of rape

Doctors said all her internal organs were damaged, causing her to have a heart attack and go into a coma.

I did not go to the trial because I think my daughter needs me here and I do not want to waste my energy on this inhuman monster. Such people must either be completely isolated from society, or I ask to return the death penalty. Mother of victim Anna Barmina

Eleven months after Ziyangareev raped her, she still hasn't spoken due to the trauma, and has lost around 30kg in weight.

The 31-year-old was left for dead, after having her money, mobile phone and laptop stolen.

Senior detective Alexander Guryev said: 'This crime deeply shocked us with its cruelty.

'We have never come across anything similar.'

Victim Anna Barmina suffered a heart attack and went into a coma after being raped by Ziyangareev

Top investigators dropped all other cases they were working on in order to prioritise catching Ziyangareev.

He was arrested after 10 days after police examined the profiles of 107 known rapists.

Ms Barmina's mother said: 'I did not go to the trial because I think my daughter needs me here and I do not want to waste my energy on this inhuman monster.

The sick rapist reportedly told police that he had no regrets and said his victims should be grateful

'Such people must either be completely isolated from society, or I ask to return the death penalty.

'My pain is too severe to go and see the person who has wrecked the life of my girl.

'I cannot afford negative emotions, I have to be strong.'

Ms Barmina's mother has called for the death penalty to be reintroduced after the brutal attack on her daughter

Describing the ordeal her daughter had gone through, Ms Barmina's mother continued: 'The Lord twice saved my daughter - she survived that terrible day, and then came through the coma and heart attack.

'Every day I pray that she will be the same happy person she used to be, that she can smile and enjoy life.

'I hope we will find a doctor who can help us.

'My daughter is alive, that is the main thing.

'We sleep, wake up in the morning, listen to music but I want her to be able to live.'

In the same week, Ziyangareev also raped a 42-year-old woman. Details about his other victims have not been released

Another victim the same week was aged 42, but details of his conviction for raping and robbing three other women in September 2015, and two further similar cases in 2009 and 2010, have not been released.

The serial rapist confessed to his crimes but did not repent, said police.

The Komsomolskaya Pravda newspaper reports: 'He told police he did nothing bad to these women and they should be grateful to him.'

A friend of Ms Barmina warned that her attacker will one day get out of jail and continue to rape

A friend of Ms Barmina said: 'This attacker is not a human, he's a monster.

'I just cannot understand how the court could give such a lenient term.

'Anna will never get up, she will never speak... she has no future because of what he did.

'And he will get out of jail one day and continue to rape.'

A police source said: 'Ziyangareev never had problems with women, in fact he had many lovers.

'He had been married in the past and has two daughters and a son.