article_snippet.sent: The sport has been rocked by allegations that doping and cover-ups are rife in Russian athletics.
article_snippet.sent: Speaking on Wednesday, the 51-year-old said: 'We need to show clear zero tolerance for doping.'
article_snippet.sent: Sergey Bubka said there was 'no acceptance for cheaters', adding: 'We must protect clean sport, clear athletics.'
article_snippet.sent: Sergey Bubka also called for a 'very deep study' to look at the possibility of imposing sanctions on national federations who have a high number of doping cases, given the associated legal complications. '
article_snippet.sent: You would like to do many more sanctions, you would like to do more punishment, but to combine it legally it's always created an issue,' Sergey Bubka said.
article_snippet.sent: We need to study legally how We can strengthen We position, in which way We can put sanctions, if We need to put sanctions on the national federation which violates, I believe an issue needs to have very deep study.'
article_snippet.sent: Sergey Bubka emphasised the need to hold members of an athlete's entourage, like coaches and doctors, to account in doping cases, the importance of education in the fight against doping and collaboration with the World Anti-Doping Agency and national federations.
article_snippet.sent: An Anti-Doping test is taken during the  European Athletics Championship in Zurich in August last year . '
highlights_snippet.sent: Sergey Bubka promised crackdown on doping and review of athletics as a whole .