Watch The Knockout Banned From The UFC

Russia's Timofey Nastyukhin knocked out Australia's Rob Lisita in a featherweight bout at ONE Championship 43 in Thailand in the most punishing fashion.

He unleashed a brutal soccer kick at the Aussie's head before the referee ran in to push Nastyukhin away and end the fight.

Those types of kicks  - when one fighter is on the floor - are illegal in the UFC and many other promotions because they're considered too dangerous, but are still allowed in some leagues.

NZ Herald