On the second night of his visit to Kyiv, Erik Prince had a dinner date on his agenda. A few of his Ukrainian associates had arranged to meet the American billionaire at the Vodka Grill that evening, Feb. 23, 2020. The choice of venue seemed unusual. The Vodka Grill, a since-defunct nightclub next to a KFC franchise in a rough part of town, rarely saw patrons as powerful as Prince. As the party got seated inside a private karaoke room on the second floor, Igor Novikov, who was then a top adviser to Ukraine’s President, remembers feeling a little nervous....