It's kind of irritating, but unless I'm missing something in the 3 paragraphs before the table of contents in the Wikipedia page War crimes in the 2022 Russian invasion of Ukraine, there doesn't seem to be quite a distinction like
War crimes of Russia: So and so
War crimes of Ukraine: So and so
Not sure how those 3 paragraphs arrange stuff, but anyway scanning the 3 paragraphs I've found
Russian and Ukrainian prisoners of war have been repeatedly abused and exposed to public curiosity, and on at least two occasions Russian prisoners have been tortured and killed.
Besides the above quote and the section 'Treatment of prisoners of war' - subsection 'Russian prisoners of war' (which is probably what the above quote was summarising), is that it for Ukrainian war crimes (committed during the 2022 Russian invasion of Ukraine) ?