Vitali Klitschko has withdrawn from the May 25 presidential race in Ukraine to endorse fellow millionaire member of parliament Petro Poroshenko. Klitschko, the world heavyweight boxing champion and head of the Ukrainian Demcratic Alliance for Reform, will run for mayor of Kyiv, according to Interfax-Ukraine news service.

Klitschko, whose party is one of three holding a convention today, called on democratic forces to unite behind Poroshenko as the sole candidate in the race.