@emacsomancer it's not really a new thing Russians are already using this technique to poison training data:
Russian networks flood the Internet with propaganda, aiming to corrupt AI chatbots
A pro-Russia network is internally corrupting large-language models to reproduce disinformation and propaganda.
Bulletin of the Atomic Scientists (thebulletin.org)
Edit: there is some newer reporting on that matter, but I can't find it right now/don't have it anywhere at hand