What did the Soviet Union originally exchange with PepsiCo for their Pepsi syrup?

PepsiCo, Inc. is an American multinational food, snack, and beverage corporation headquartered in Harrison, New York, in the hamlet of Purchase. PepsiCo has interests in the manufacturing, marketing, and distribution of grain-based snack foods, beverages, and other products. PepsiCo was formed in 1965 with the merger of the Pepsi-Cola Company and Frito-Lay, Inc. PepsiCo has since expanded from its namesake product Pepsi to a broader range of food and beverage brands, the largest of which included an acquisition of Tropicana Products in 1998 and the Quaker Oats Company in 2001.

In 1959, the USSR held an exhibition of Soviet technology and culture in New York. The United States reciprocated with an exhibition in Sokolniki Park, Moscow, which led to the famous kitchen debate. One of the American products exhibited was Pepsi Cola. After obtaining a photo of U.S. President Richard Nixon and Soviet Premier Nikita Khrushchev sipping Pepsi, Pepsico executive Donald Kendall was able to capture the attention of the Soviet people and, in 1972, negotiate a cola monopoly in the USSR. Due to Soviet restrictions on transporting rubles abroad, PepsiCo struck a barter deal whereby Stolichnaya vodka would be exchanged for Pepsi syrup. This deal lasted until 1990, when the USSR and PepsiCo re-negotiated a $3 billion deal to exchange syrup for vodka and a small fleet of Soviet warships including 17 submarines, a frigate, a cruiser and a destroyer.