White & Case has been fined a record £250,000 ($325,700) by the U.K.’s Solicitors Disciplinary Tribunal for failing to identify a conflict of interest and protect confidential financial information in a $2.6 billion dispute involving Ukrainian oligarch Victor Pinchuk.

The SDT also levied an additional £50,000 ($65,140) fine against White & Case arbitration partner David Goldberg, who splits his time between the firm’s offices in London and Moscow.