With tensions between the U.S. and China threatening to slow down global trading volume even further, export-reliant economies such as Japan, South Korea and Taiwan will likely be most badly hit, according to an economist from Moody's Analytics.

Asian economies such as Japan, South Korea and Taiwan are "highly exposed" to the Chinese economy, said Steve Cochrane, chief Asia Pacific economist at Moody's Analytics. He explained that in addition to serving Chinese consumers, those three economies also supply products that factories in China assemble and sell to markets such as the U.S.

"They depend very highly on trade linkages with China, and (are) very tightly tied in to both domestic demand in China and in terms of the broader supply chains. So they're very, very highly exposed," Cochrane told CNBC's "Squawk Box" on Tuesday.

China and the U.S. — the world's two-largest economies — are engaged in a tariff fight that started more than a year ago. Last month, tensions between the two countries expanded beyond trade and into areas such as technology and security.

Citing national security interests, Washington placed Huawei on a blacklist — a move that restricts American firms from doing business with the Chinese telecom equipment maker.