Is that a joke? I didn’t see any evidence in the first two links. There are a couple anecdotes in the last article. I’m sure there’s all kinds of unpleasantness in such camps (and in corresponding Ukrainians camps), but I don’t see much to justify the usual propaganda out of the Capitol District.
Meanwhile, hundreds of American patriots have been imprisoned in solitary for years on misdemeanor charges in the DC Lubyanka, beaten and psychologically tortured by their guards.
Then wait for the story to develop if you can’t be bothered to use a search engine.
The fact of the story is it is serious enough for Russia to issue a denial.