A 17-year-old British high school student has become one of the youngest people sanctioned by Russia. Alexander Browder, son of the former financier turned anti-corruption campaigner Bill Browder, says he made Russia “uncomfortable” by unveiling a cryptocurrency money laundering network he says was being used by Moscow to evade U.S. sanctions.

Alexander Browder published a report in March alleging that Russia created its own “stablecoin” — a term used for cryptocurrencies tied to real assets such as hard currency — to carry out transactions that would otherwise have been blocked by sanctions imposed by the United States, U.K. or the European Union.

“My work is following the money,” Browder told CBS News, adding that by…