In 2014, some European Boomerang's reaired Animaniacs, Boomerang Russia was also airing Animaniacs during that time, but it is more or less lost right now, because it only aired for one year, some users posted some clips in Russian (2014), it was sadly terminated, now only this clips survive.
Full 4 episodes you can find here (available now only 19 episodes, other was blocked due copyright violation):
1 episode: https://vk.com/video307365996_456239342
2 episode: https://vk.com/video307365996_456239355
3 episode: https://vk.com/video307365996_456239422
4 episode: https://vk.com/video307365996_456239455
19 episode: https://vk.com/video307365996_456239618
Update: Episode 1 2 3 On vk.com have been since Takendown Due To Copyright Making The 3 Episodes Unavailable Lost
And fortunately, the theme song of the dub was found: https://archive.org/details/animaniac-rus-dub-pifagorep19boomerang