Britain has imposed sanctions on more than two dozen Russian individuals in connection with the death of lawyer Sergei Magnitsky as relations between the two nations remain frayed over what London calls Moscow’s destabilizing acts.

Addressing parliament, foreign minister Dominic Raab said: “The first designations will cover those individuals involved in the torture and murder of Sergei Magnitsky, the lawyer who disclosed the biggest known tax fraud in Russian history.

The list of 25 sanctioned Russian officials announced on July 6 includes Aleksandr Bastrykin, the head of the powerful Investigative Committee who is considered a member of President Vladimir Putin’s inner circle, as well as judges and prosecutors.

Magnitsky, a lawyer for William Browder – a U.S.-born investor who now holds British citizenship – died in a Moscow prison from an untreated illness in 2009 after accusing Russian officials of a $230 million tax fraud.