Notably, VTB would be able to collect dividends from its EN+ shares, according to the confidential document, despite the bank being under limited United States sanctions.Another Russian oligarch who faces sanctions by the United States and has attracted the interest of Mr. Mueller’s investigators, Viktor Vekselberg, also has a stake in Mr. Deripaska’s empire through a company called SUAL Partners Limited. Another investor in SUAL Partners is Len Blavatnik, a Ukrainian-born billionaire who has British and American citizenship. He donated $1 million through another company he controls to the committee that funded Mr. Trump’s inaugural festivities, which Mr. Vekselberg attended and to which Mr. Blavatnik was invited.According to the confidential document, under the restructuring agreement approved by the Treasury Department, SUAL would own 22.5 percent of Rusal, while EN+ would own 56.88 percent of Rusal.The document specifies the precise ownership stakes in EN+ of other people and entities with personal relationships to Mr. Deripaska. That includes shares owned by his ex-wife, Polina Yumasheva, a British-educated daughter of the chief of staff to Boris N. Yeltsin, a former president of Russia. She owns 5.19 percent of EN+, while her father, Valentin Yumashev, owns 1.57 percent, and a firm called Orandy Capital Limited, which reportedly has links to the family, owns another 1.78 percent, according to the document.Taken together, Mr. Deripaska, his foundation, his ex-wife, her father and Orandy Capital would own nearly 57 percent of EN+ under the deal.In its letter to Congress outlining the deal, Treasury stressed that independent trustees with “no personal or professional ties” to Mr. Deripaska will control the EN+ board votes associated with the shares owned by Mr. Deripaska’s foundation, his ex-wife, her father and the family-linked Orandy Capital, as well as those being transferred to VTB.