A polish twitter user over exaggerated a Ukrainian report. This was then retweeted by an american twitter user as though it was true, then added to a video by a british youtuber as fact, and then reposted on reddit, and now people are talking about it in this thread where people think it's happening. Unfortunately it's not real.

It's a great example of how the fog of war works against facts. it's developed into a rumour that's spread based on nothing sadly.