It is especially popular in Russia and Ukraine , but also well-known throughout Belarus , Estonia , Serbia , Poland , Latvia and Lithuania - as well as in other former Soviet states , such as Georgia , Kazakhstan and Armenia , where many kvass vendors sell the drink in the streets .
It is popular in Russia , Belarus , Ukraine , Lithuania , Latvia , Poland , Estonia , and other Eastern and Central European countries , It is also popular in former Soviet states , such as Kazakhstan and Uzbekistan , where one can see many kvass vendors in the streets .