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.
People have been saying this for over a decade. It hasn't happened. Heck, Gordon Chang's entire career is based off writing a "China is about to collapse" book every couple years. If anything, their economic position has continued to strengthen.