Bill Browder has won his latest legal battle with Russia after a High Court judge in London ruled that a Moscow-based insolvency expert investigating him for alleged tax evasion in a bankruptcy case "breached his duty of full and frank disclosure" to the court.

The bankruptcy case was filed in London in 2016 by Kirill Nogotkov, an insolvency expert working for the Russian tax agency. Lawyers for Browder — a former hedge fund manager who campaigns for international sanctions against Russian officials he accuses of corruption — argued that Nogotkov was part of a "retaliatory campaign by the Russian state".