Putin can use any justification he wants for the Russian war against Ukraine - be it abusive father, oppression of Russians and Korsun Massacre, or the price of tea in China. None of them valid.
Korsun Non-Event is a better description than Massacre. By the way, “massacre” is a terrible translation of the Russian phrase which itself is an exaggeration. (Russians use the word “pogrom”. Get it? Russians suffering like the Jews ;)
If you like, you can call it, “Stoppage of a Bus transporting titushki back to Crimea from Kyiv (where they in tandem with Berkut were murdering protesters on Maidan on live TV) during which some of them were beaten by the incensed Ukrainian locals and humiliated, but otherwise NONE have been killed.” — sorry if it’s not as sexy as “Korsun Massacre”
If you do want to see a video of murder by a mob, there’s a beating of a pro-Ukrainian group in Donetsk. The victim there is an actual person with a name.
Exactly, you don’t see Poles using Volhynia as justification to invade Ukraine.