There were pogroms and mass murders at the ground level and there were laws targeting Russian speakers from the governmental level. The weapons Trump was impeached for tying political favors to were being used against resistance militias. They were being used to bomb facilities built in the soviet era that pump hot water into people's homes as the local method of heating during the winter. They locked over a hundred people in a building and burned them alive in it. They broke multiple treaties with Russia in order to do all of this. This was the lead up to the war.
I'm talking about the targeting of ethnically Russian Ukrainians in the eastern part of Ukraine (the Donbas region.)
There has been attacks against these people going on since 2014. Thousands upon thousands have died and more have been wounded in this low-grade civil war that became the prelude to the war between Russia and Ukraine.
Here's a western article filtered through western intelligence describing the situation with some glaring oversights, namely that there has been ultranationalist paramilitary forces operating in the Donbas (Azov, Right Sector, C14, National Militia, OUN et al.) with tacit approval from the Ukrainian government since 2014 and that civilian targets have been routinely been used by the military and the paramilitary groups.
Here's a short article written by a former USAID officer (!) published by The Atlantic Council (!!) that describes the problem with far-right militias in Ukraine, just so there's no accusations of bias from me in this discussion.
They've literally been targeting civilians who are of the "wrong" ethnicity for nearly a decade now. If that doesn't count as an attempted genocide, I don't know what would.
Also that's some cheap framing of the discussion btw. Fascism isn't "don't play defence". I take it that you have gotten your picture of fascism from a particular, well-known YouTube series. If so, that series is critically flawed and it does a bad job of defining fascism and how it functions. But that's a different discussion altogether.
I think you will find Putin flooded the Donbas with Russian citizens with the promise of homes and land long before this war, the people you call Russian Ukrainians are just Russians nothing more nothing less.