The 220lb Klitschko, who at 6ft 6in is three inches taller than Sacha, revealed all about the amazing set-to to Setanta Sports News star Charlotte Jackson.
Klitschko, who now has Ukrainian nationality, told her: «It was hilarious. I told the waiter, ‘Watch, I am going to have some fun with him’.
As he walked past me I turned to face him and said, ‘Hey, I think you are an arsehole for what you said about Kazakhstan’.
Unbelievably, he started to defend himself – but before he could continue I stood up and was towering over him. I said, ‘I have broken people’s necks for less than what you have done’.
He looked frightened – like he had picked a fight with the wrong man. And then I owned up and told him I really think his Borat character is amazing. He looked pretty relieved!»