The Washington Post reported on March 6, 2018, that Mueller's office had requested documents and interviewed witnesses regarding activities of Michael Cohen, Trump's longtime personal lawyer. Investigators are reported to be interested in at least two episodes relating to Russian interests, including the proposed construction of Trump Tower Moscow and "a Russia-friendly peace proposal for Ukraine that was delivered to Cohen by an Ukrainian lawmaker one week after Trump took office". The New York Times reported, on January 10, 2019, that Mueller investigators, and other federal prosecutors, were investigating the activities of over a dozen Russia-aligned Ukrainian political and business figures who attended the Trump inauguration, ostensibly promoting a pro-Russian "peace plan" for Ukraine that included the lifting of sanctions against Russia. Andrey Artemenko, a Ukrainian politician who attended the Trump inaugural, was interviewed by the FBI and the Mueller grand jury, having met, days after the inaugural, with Trump attorney Michael Cohen and former Trump business associate Felix Sater, in New York, to present a proposal. Cohen hand-delivered Artemenko's proposal to Michael Flynn one week before Flynn resigned as national security advisor.
The New York Times reported on March 3, 2018, that the Mueller investigation had been examining possible efforts by the United Arab Emirates (UAE) to buy political influence by directing money to the Trump campaign. Investigators had recently interviewed Lebanese-American businessman George Nader, and other witnesses, about this matter. Nader was reportedly a frequent White House visitor during 2017 and investigators have inquired about any policymaking role he may have had. Investigators have examined a meeting around January 11, 2017, in the Seychelles that was convened by the UAE Crown Prince Mohammed bin Zayed Al Nahyan (known as "MBZ"), which Nader attended. Also present at that meeting were Kirill Dmitriev, the CEO of state-owned Russian Direct Investment Fund, who is close to Vladimir Putin; and Blackwater founder Erik Prince, a major Trump donor and an informal advisor to the Trump transition. UAE officials reportedly believed that Prince was representing the Trump transition and Dmitriev was representing Putin. The Mueller report later found that Nader had represented Prince to Dmitriev as "designated by Steve [Bannon] to meet you! I know him and he is very very well connected and trusted by the New Team," while Prince "acknowledged that it was fair for Nader to think that Prince would pass information on to the Transition Team," although Bannon told investigators that Prince had not informed him of the Dmitriev meeting in advance. Prince testified to the House Intelligence Committee that "I didn't fly there to meet any Russian guy," although the Mueller report found that he and Nader made significant preparations to meet Dmitriev. Although Prince characterized a second meeting between him and Dmitriev in a hotel bar as a chance encounter of no consequence, the meeting was actually pre-arranged after Prince had learned from calls back home that Russia had moved an aircraft carrier off Libya and he wanted to convey that the United States would not accept any Russian involvement in Libya.
More InfoAgents with search warrants copied the contents of Nader's electronic devices and served him with a subpoena to appear before a grand jury on January 19. CNN also reported that Nader had attended a December 2016 meeting in New York attended by MBZ; UAE ambassador to the US Yousef Al Otaiba; and at least three Trump senior associates: Michael Flynn, Steve Bannon, and Jared Kushner. The Wall Street Journal reported on April 2, 2018, that Mueller's investigators have inquired about the work done by a private consulting company, Wikistrat, on behalf of the UAE. One of the firm's co-founders, Joel Zamel, has reportedly been asked about his work with certain clients and his business relationship with George Nader. The Journal reported that, like Nader, Zamel had tried to forge a relationship with the new Trump administration.
More InfoCNN reported on April 4, 2018, that Mueller's investigators have been examining whether Russian oligarchs directly or indirectly provided illegal cash donations to the Trump campaign and inauguration. Investigators were examining whether oligarchs invested in American companies or think tanks having political action committees connected to the campaign, as well as money funneled through American straw donors to the Trump campaign and inaugural fund. At least one oligarch was detained and his electronic devices searched as he arrived at a New York area airport on his private jet in early 2018; subsequent reporting by The New York Times identified the man as Viktor Vekselberg. Vekselberg was questioned about hundreds of thousands of dollars in payments made to Michael Cohen after the election, through Columbus Nova, the American affiliate of Vekselberg's Renova Group. Another oligarch was also detained on a recent trip to the United States, but it is unclear if he was searched. Investigators reportedly have also asked a third oligarch who has not traveled to the United States to voluntarily provide documents and an interview.
More InfoAxios reported on March 4, 2018, that it had seen a grand jury subpoena that Mueller's office sent to a witness in February 2018. Axios did not name the witness. The subpoena reportedly demands all communications, from November 1, 2015, to date, that the witness sent or received "regarding" Trump; Carter Page; Corey Lewandowski; Hope Hicks; Keith Schiller; Michael Cohen; Paul Manafort; Rick Gates; Roger Stone; and Steve Bannon. A subsequent report by NBC News stated that the subpoena also encompasses "work papers, telephone logs, and other documents". On March 5, 2018, the witness was identified as Sam Nunberg, who served as a communications consultant on the Trump campaign until August 2, 2015, and later as an informal adviser. Nunberg stated that he had been subpoenaed to appear before a federal grand jury on March 9, 2018, but he would refuse to appear or provide any of the subpoenaed documents. After multiple defiant television appearances on March 5, 2018, Nunberg indicated the next day that he planned to comply with the subpoena.
More InfoThe New York Times reported on April 9, 2018, that the Mueller investigation is examining a $150,000 donation Victor Pinchuk, a Ukrainian billionaire, made in September 2015 to the Donald J. Trump Foundation in exchange for a 20-minute appearance Trump made via video link to a conference in Kiev. This transaction came to light in documents the Trump Organization provided to investigators pursuant to a subpoena earlier in 2018. The donation, the largest the Foundation received in 2015 other than from Trump himself, was solicited by his attorney, Michael Cohen. The Times reported that the subpoena had demanded "documents, emails and other communications about several Russians, including some whose names have not been publicly tied to Mr. Trump".
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