The case is part of the labyrinthine saga surrounding the death of Magnitsky, a Russian lawyer hired by Hermitage Capital, who accused Russian police officials of stealing $230 million in tax rebates after illegally seizing Hermitage subsidiaries.
Magnitsky was arrested in 2008 for tax evasion and died in prison the next year of pancreatitis at age 37, allegedly after being beaten and denied medical treatment. He had not been brought to trial.
His death spurred efforts in Europe and the U.S. to punish Russian officials who may have been complicit in human rights abuses. The United States imposed sanctions on 18 Russians including Karpov, one of the Interior Ministry officers who put Magnitsky behind bars.
Russia responded by banning Americans from adopting Russian children.
Russian authorities have also pursued Browder and Magnitsky, who was convicted of tax evasion in July, three years after his death. Browder was convicted in absentia and sentenced to nine years in prison.