A Russian oligarch embroiled in Britain's costliest divorce offered to pay his ex-wife £4million-a-year for life plus an £80million lump sum when he dies - but she turned it down, MailOnline can reveal.

Billionaire Farkhad Akhmedov says he also made two other multi million pound offers which included allowing her to keep a £30million art collection at their former home.

But the mother-of-two rejected the extraordinary offer even though she now runs the risk of missing out on a multi-million pound payout altogether.

Her refusal to accept a settlement led to a court ordering him to pay her £453million following lengthy divorce proceedings two years ago.

But Akhmedov has ignored a divorce ruling at London's High Court to pay her half of his fortune of and has refused to hand her any money since their divorce.

Tatiana Akhmedov (pictured left with her divorce lawyer Fiona Shackleton) is involved in Britain's biggest divorce settlement worth £453m from her ex-husband Frakhad Akhmedov

Oil and gas tycoon Akhmedov (pictured) offered to pay his ex-wife £4million-a-year for life plus an £80million lump sum when he dies - but she turned it down, MailOnline can reveal

Akhmedov made two further offers to his ex-wife, which would also have made her the beneficiary of a £120million trust fund and allowed her to keep the £15million Surrey mansion called Somerton House (pictured) as well as its contents of art and antiques worth £30million

As a result the oil and gas billionaire's super yacht Luna has been seized by the court with its ownership due to be decided by a Sharia court in Dubai.

Tatiana wants to sell the £353million yacht while her ex-husband has said he will never relinquish ownership and would rather see it sold for scrap.

The billionaire is hopeful a Russian court will rule that he and his wife – who had an affair with a friend of her son's while her husband was away on business – will prove that he was already divorced when his wife brought proceedings in the UK.

Akhmedov has always claimed that the English Court had no rights to impose any settlement since the couple had divorced in Moscow in 2000, while they were both Russian citizens.

His wife's long-running affair with a IT consultant Mark Isle was cited as one of the reasons for the separation.

Since 2012 the warring couple have been involved in a legal battle in London, Lichtenstein, Russia, Dubai and the Marshall Islands that has cost millions as they wrangle over his £1billion fortune.

Documents seen by MailOnline reveal that the billionaire attempted to make a clean break settlement with his ex before the court awarded her half his money.

In March 2014 before the court ruling he offered her an immediate £40million one off payment plus payments of £4million-a-year for life.

As a result of their failure to agree a deal, the oil and gas tycoon's super yacht Luna (pictured) has been seized by the court with its ownership due to be decided by a Sharia court in Dubai

Tatiana wants to sell the £353million yacht her ex-husband bought from Roman Abramovich while her ex has said he will never relinquish ownership and would rather see it sold for scrap

It would also have made her the beneficiary of a £120million trust fund and allowed her to keep the £15million Surrey mansion called Somerton House as well as all its contents.

These included paintings by Russian old master Ivan Aizavovsky and antique furniture, including Napoleon's writing desk, valued at £30million.

A second offer, made in December 2015 provided £4million-a-year maintenance for life with a further £80million on the death of her ex-husband, who is 13 years her senior.

Other offers followed with a lump sum payment of £20million plus £4million a year maintenance and the payment of a further £60million upon his death.

The offers again allowed Tatiana to keep Somerton House and its paintings and antiques.

A spokesman for Mr Akhmedov confirmed the offers but denied that they were made on the basis of any admissions.

He said: 'Mr Akhmedov had looked after his ex-wife lavishly since their divorce enabling her to live like royalty. These further incredibly generous offers were made to ensure that she and the couple's two children could never possibly want for anything.

When the Akhmedovs were together they enjoyed lavish lifestyles flying around the world on private jets (pictured), staying in the finest hotels and with a lavish property portfolio

Mr Akhmedov says he has given his ex-wife a home in Weybridge, Surrey (pictured) enabling her to live like royalty, he says, with a full staff of housekeepers, gardeners and chauffeurs

'He wanted to do everything possible to keep his family together. Above all he wanted to ensure that the money held by the family trust remained intact for the benefit of all his dependants and not just one ex-wife.

'That has always been his position. It is why he and lawyers for the trust are resisting all attempts to enforce what he believes is a misguided and wrong decision by the English High Court.'

Both Farkhad and Tatiana's sons are supporting their father in his legal battle, the spokesman said.

Each has sworn statements in support of their father confirming their mother's infidelity with Mr Isle, the brother of a schoolfriend of theirs.

Sources told MailOnline that since the £453million award was made in favour of Tatiana and her legal team, led by celebrity divorce lawyer Fiona Shackleton, Akhmedov has cut off payments to his ex-wife.

Her global legal battle to enforce the court settlement is being bankrolled by litigation finance company Burford Capital in return for a share of up to 30 per cent of any settlement money recovered from Mr Akhmedov.

A final ruling on releasing the Luna from Dubai is expected to be made by the Emirate's local sharia courts.

The Luna, which was bought from Chelsea owner Roman Abramovich and boast a crew of 50, was originally seized in February when it arrived in Dubai as part of a freezing order on his assets ordered by the High Court.

The legal battle over its ownership will be heard by a Sharia court in October in the Arab kingdom.

Akhmedov is confident that the court will rule in his favour with documents from Russia showing they were already divorced before the UK court ruling and so making it invalid.

A spokesman for Tatiana was unavailable for comment.