To be fair, in my experience LLM-s struggle to some extent with nearly every language that isn't English. Compared to many others, English is a very simple language and it has the largest body of material to learn from to boot. The more nuanced a language, the more LLM-s spout garbage.
Russian-speaking web was pretty strong once. There was a lot of educated people in ex-USSR who were apt with tech, knew Russian well and were willing to use it.
That's very much in the past now. But it'll linger in the training data for a while.
