Ilya Traber — an oil port owner in Ust-Luga with sprawling commercial interests, known by the nickname “the Antique Dealer” — was detained in St. Petersburg on June 17. Russia’s Federal Security Service, the FSB, led the operation, and the country’s Investigative Committee opened a criminal case in Moscow linked to his alleged role in the murder of Alexander Petrov, a lawmaker. Traber’s business partner Vladimir Danilenko was also detained. Investigators also searched the home of Gennady Petr...