Kvass, as it seems to have always been translated, is a traditional drink in Russia and other countries, usually made by fermenting rye.

The so-called Wahaha kvass is just an imported product and not authentic in my opinion.

In this case, why does Russia import?

"Kvass" originated in Russia and has a history of a thousand years. There are records that when the Russian aristocrats at that time traveled to Paris, the upper-class society they longed for, they felt so miserable because there was no kvass there that they even returned home. Kvass/Kvass (Russian, Ukrainian: квас, meaning "fermented"; Polish: kwas chlebowy, meaning "leavened with bread"; Lithuanian: gira; Estonian: kali) is a kind of food popular in Russia, A low-alcoholic drink from Ukraine and other Eastern European countries, fermented and brewed from rusk. The color is similar to beer and slightly red, with moderate sweetness and sourness. Since its alcohol content is only about 1%, it can also be consumed by children, making it a very popular soft drink. In addition, in Russian cities, kvass can also refer to kombucha. The drink was later introduced to Harbin, Jilin, Ili, Tacheng, Urumqi and other regions in Xinjiang. ?[1]?