According to CD Projekt RED, the "Ballads of the Past" expansion for The Witcher 3 will not have Russian voice acting – only subtitles and interface.
Due to our decision to cease cooperation with tax residents of Russia and Belarus since March 2022, the "The Witcher 3: Wild Hunt – Ballads of the Past" expansion will not have Russian voice acting. Upon launching the expansion, the audio will automatically switch to Polish. The text, as before, will be fully translated, and Russian voice acting will remain in the main game and its first two expansions.