There has been no quantitative data released but based on solid reporting in re-taken areas e.g., Bucha it is evident that there were large-scale arbitrary executions.

By contrast, Russian media has presented little evidence of large-scale executions. There have been individual cases but there is no evidence to suggest it is as systemic.

While you are right to critique my claim, which I should not have made with such certainty perhaps, one can collate the available evidence and make a claim with reasonable-albeit not total-confidence. If Russia did have evidence of large-scale execution of PoWs, they'd obviously put it in their own friendly media outlets + it would be in Russian Telegrams.