Earlier quoted context omitted.
When USA nuked Japanese civilians we didn't call it genocide. Targeting civilians is not the definition of genocide.
But the targeting of a specific ethnic group, because they are that ethnic group is, isn't it?. I think this is a pretty good article on the topic, https://www.bbc.com/news/world-europe-61017352 and presents both perspectives.
Instead of calling it a genocide, call it a massacre. Russia is massacring Ukranians, nobody is arguing against that, and the world stopped accepting such behavior even in wars a long time ago. Prematurely calling it a genocide just makes people stop listening to you.