Yes I am aware Hopak is a dance.
But the point is there is Combat Hopak as well, considered to be based upon martial movements in the dance and also most likely other techniques.
Time-stamped. You can see them doing drils and some form of sparring.
It was founded by this guy, Volodymyr Pylat who is a Ukrainian Cossack.
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https://hopak.km.ua/
https://en.m.wikipedia.org/wiki/Combat_Hopak
"
It can be trained in light, semi and full contact formulae. Combat Hopak includes techniques of traditional Ukrainian folk fist fighting, folk wrestling, Cossack sabre fencing, and Cossack war dances like the Hopak and the Metelystia".
So even if it's basically some kind of modern form mixed with some Ukrainian folk wrestling and Hopak dance it's still legit and pretty cool I think.