Ex-adviser to the head of the office of the President of Ukraine Alexey Arestovich ** walked over boxer Alexander Usyk, who on the eve became the absolute world heavyweight boxing champion and likes to demonstrate his Orthodox faith.

BBC Sport looks at where Oleksandr Usyk ranks among the all-time heavyweight greats and who in the current generation could beat him.

An undisputed heavyweight champion will be crowned on Saturday when Oleksandr Usyk battles Daniel Dubois. Usyk currently holds the WBC, WBA and WBO titles, while Dubois is the IBF champion. The two are set to slug it out at Wembley Stadium in London ( DAZN PPV, 12:30 p.m. ET -- buy now ).