Sorry I think you’re right that I might be misunderstanding you. You mean the shelling of civilian centers, including with cluster munitions, by the Ukrainian armed forces was BS? That is a verifiable fact though. That’s why I thought you must be referring to something else.
It was reported on by the UN Human Rights Council and the NYT back in 2014/2015, back when such stories could still be printed, not exactly famed Russian-biased propaganda outlets or questionable internet sources.