A Russian banker who has been placed under sanctions sold more than £15m of shares in a cryptocurrency firm chaired by the former chancellor Philip Hammond in a transaction that experts say could have attracted scrutiny from US sanctions enforcers.
Executives at the London-based Copper Technologies are understood to have become concerned when Mikhail Klyukin, who owned more than 2% of the company, was put on the White House’s sanctions list in March 2022.
