Kilimnik wrote in the July 29 email that he had met that day with the person “who gave you the biggest black caviar jar several years ago,” according to the people familiar with the exchange. Kilimnik said it would take some time to discuss the “long caviar story,” and the two agreed to meet in New York.

Investigators believe that the reference to the pricey Russian luxury item may have been a reference to Manafort’s past lucrative relationship with Deripaska, according to people familiar with the probe. Others familiar with the exchange say it may be a reference to Ukrainian business titans with whom Manafort had done business.

Kilimnik and Manafort have previously confirmed that they were in contact during the campaign, including meeting twice in person — once in May 2016, as Manafort’s role in Trump’s campaign was expanding, and again in August, about two weeks before Manafort resigned amid questions about his work in Ukraine.

The August meeting is the one the two men arranged during the emails now under examination by investigators.

That encounter took place at the Grand Havana Club, an upscale cigar bar in Manhattan. Kilimnik has said the two discussed “unpaid bills” and “current news.” But he said the sessions were “private visits” that were “in no way related to politics or the presidential campaign in the U.S.”

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