Russian former professional boxer Nikolai Valuev first won in 2005 the heavyweight champion title from this American former professional boxer of which ethnicity?
Nikolai Valuev: Nikolái Sergéyevich Valúev (Russian: Никола́й Серге́евич Валу́ев ; born 21 August 1973) is a Russian former professional boxer who competed from 1993 to 2009. Nikolai Valuev:  He is a two-time WBA heavyweight champion, having first won the title from John Ruiz in 2005 and losing it to Ruslan Chagaev in 2007.
i don't know