per the definition of genocide that I found on the UN's website, they are easily committing at least one of the points that defines a genocide. That is

- Forcibly transferring children of the group to another group.

https://www.un.org/en/genocideprevention/genocide.shtml

> he doesn't intend to kill all Russians, just the "Russians" who refuse to be Russians.

Given the slaughter of civilians in the majority pro Russian regions of Ukraine i'd argue that is easily false.