No, not "one half". And a plenty of ethnic Russians have fought for Ukraine as volunteers. (Even some Russian citizens did, and I don't mean just the Chechen battalions.)

And to speak of the Chechen battalions, Putin's adoptive son Ramzan apparently shares your Faggot Theory of Politics:

Kadyrov called the Chechens fighting on the Ukrainian side traitors, saying they were former Chechens who sold themselves to the Europeans. Europe armed them and sent them to fight in Ukraine, he said, adding that the pro-Ukrainian Chechens had spent much time in Europe, which perversely affected them

https://jamestown.org/program/two-chechen-battalions-are-fighting-in-ukraine-on-kyivs-side/

And Ramzan's round up of them queers few years ago caused quite a gay panic in America, with such unlikely results like the complete social justice takeover of the White Wolf RPG company in some incomprehensible series of events. So Islamophobic!