Russian Phonemizer for DiffSinger for OpenUTAU utilizing a custom Russian G2p model.
Download diffs_ru_hhskt.dll from this link, and drag the file into an open OpenUTAU window. Don't forget to restart OpenUTAU.
This phonemizer looks for dsdict-ru-hhskt.yaml to load phonemes, grapheme overrides and phoneme replacements.