Hermitage asked for the return of the materials but was told they were in the custody Karpov.
Magnitsky testified, naming Karpov, Kuznetsov, and other officials.
Karpov, Kuznetsov, Stepanova and Khimina were all sanctioned under the U.S. Magnitsky Act in April 2013.
Karpov alleged that he was honor-bound to protect his “substantial reputation in the jurisdiction of England and Wales.”
Neither the flacks nor the lawyers would confirm their fee arrangements with Karpov.