Sergey Bubka: Athletics Integrity Unit looking into payment to ex-IAAF treasurer

A payment made by the senior vice-president of athletics' world governing body to its banned former treasurer is under investigation.Sergey Bubka made a $ 45,000 (£33,400) payment to Valentin Balakhnichev, according to French newspaper Le Monde.The Athletics Integrity Unit (AIU) is to look at the case, though ex-pole vaulter