Criticism is a great motivation. Failure is not an option to me.

I'm quite shocked by the recent British media stories about an alleged brawl between myself and Dereck Chisora. I am a professional prize fighter and let my fists do the talking only inside the ring. I don't want to comment on Chisora's psychological issues.

Aggression means emotions. Emotions means you’re gonna get off your plan and that means you’ll lose the fight.

I will teach you how to behave yourself in the ring.

I learned in my Ph.D. the discipline I needed to be successful. Most boxers are not that disciplined. They have talent, but the self-organization - the ability to schedule yourself and your priorities - is lacking. My studies were about the control of training on both the psychological and the physical side.

I don't care where people come from. It is not important to me. If you are good people will like you, if you're not, they won't. It is simple.

After Chernobyl, thousands and thousands of people, if not millions, were given a death penalty and had to pay the price, our father among them.