Credit Suisse owes former Georgian Prime Minister Bidzina Ivanishvili hundreds of millions of dollars for failing to protect the billionaire’s money in a trust pilfered by a manager, a Singapore court ruled on Friday.

It is the latest scandal for the Swiss bank whose yearslong problems forced its takeover by a rival.

In 2004 Mr Ivanishvili put more than 1.1 billion US dollars (£0.9 billion) into a trust overseen by the bank’s Singapore subsidiary, Credit Suisse Trust Limited, and the employee managing the trust “misappropriated many millions of dollars” over nine years before being caught and sent to prison, the Singapore International Commercial Court said.

Credit Suisse Billionaire Lawsuit
A Singapore court has ruled that Credit Suisse owes billionaire and former Georgian Prime Minister Bidzina Ivanishvili hundreds of millions of dollars for failing to protect his money in a trust pilfered by a manager (Sergei Grits/AP/PA)

The billionaire businessman, who amassed a fortune in Russia before serving as Georgia’s prime minister from 2012 to 2013, sued the Swiss bank for about 1.2 billion dollars (£0.97 billion), saying it failed to properly administer the trust and keep its assets safe.

“The judgment published today is wrong and poses very significant legal issues,” Credit Suisse said in a statement. “Credit Suisse Trust Limited intends to vigorously pursue an appeal.”

The bank has previously acknowledged that it did not take reasonable steps to protect the trust’s assets as of the end of 2008 and agreed to pay more than 79.4 million dollars (£64.4 million) last year in a settlement.

“The defendant is liable to compensate the plaintiffs for their loss,” which has been calculated at 926 million dollars (£751 million), minus the amount of the settlement, Judge Patricia Bergin said in a ruling.

She added that any payout in a related case in Bermuda must be reduced so there is not “double recovery”.

The bank has appealed against a decision by the Supreme Court of Bermuda that Credit Suisse failed to prevent “fraudulent mismanagement” of Mr Ivanishvili’s assets in two life insurance policies taken out with Credit Suisse Life, a subsidiary based in the island territory.

Mr Ivanishvili claimed damages of nearly 554 million dollars (£449 million) in that case.

The once-venerable Swiss lender has seen a string of scandals over the years that hit the heart of its business, ranging from bad bets on hedge funds to failing to prevent money laundering by a Bulgarian cocaine ring and accusations it did not report secret offshore accounts that wealthy Americans used to avoid paying US taxes.

The Swiss government hastily orchestrated a 3.25 billion dollar (£2.64 billion) takeover of Credit Suisse by UBS in March after Credit Suisse’s stock plunged and customers quickly pulled out their money, fearing its collapse could further disturb global financial markets following the failures of two US banks.

UBS is trying to close the deal shortly, with the European Union’s executive branch signing off on it on Thursday.

A day earlier, UBS chairman Colm Kelleher said Switzerland’s largest bank is “worried about cultural contamination” and has used what he dubbed a “culture filter” to determine whom to bring over from Credit Suisse.

The takeover “comes with huge integration risks, but we think once we get through that, the clear value that can be created is very obvious”, he said at the Wall Street Journal’s CEO Council Summit in London.