Arguably, the United States, both at home [0] and abroad (e.g., Yemen, where the US has been an active supporter of Saudi policy) as part of it's war with any entity seen as insufficiently hostile to Iran.) Of course, defenders will minimize, excuse, and rationalize each of the acts charged to be part of each of those genocides (and, in the latter case, claim that the US isn't responsible for the actions it actively supports but mostly doesn't carry out directly). But then, that's what people carrying out genocides tend to do (certainly, it's what China does with regard to the Uighur genocide), especially in the post-Nuremberg world, where there is a concrete international rejection of overt genocide.

[0] https://www.theguardian.com/commentisfree/2019/nov/15/black-...

Yemen rings a bell...

When did Yemen become a western nation?