Leaks: Commerce Secretary's Offshore Ties to Putin ‘Cronies'

The shipper, Navigator Holdings, earns millions of dollars a year transporting gas for one of its top clients, a giant Russian energy company called Sibur, whose owners include the oligarch and Mr. Putin's family member. Despite selling off numerous other holdings to join the Trump administration and spearhead its "America first" trade policy, Mr. Ross kept an investment in Navigator, which increased its business dealings with Sibur even as the West sought to punish Russia's energy sector over Mr. Putin's incursions into Ukraine.

Partnerships used by Mr. Ross, whose private equity firm has long been the biggest shareholder in Navigator, have a 31 percent stake in the company. Though his personal share of that stake was reduced as he took office in February, he retained an investment in the partnerships valued between $2 million and $10 million, and stood to earn a higher share of profits as a general partner, according to his government ethics disclosure and securities filings.

Mr. Ross's stake in Navigator has been held by a chain of companies in the Cayman Islands, one of several tax havens where much of his wealth, estimated at more than $2 billion, has been tied to similar investment vehicles. Details of these arrangements surfaced in a cache of leaked files from Appleby, one of the world's largest offshore law firms, which administered some 50 companies and partnerships in the Caymans and elsewhere connected to Mr. Ross.