<prompt> Bhala ukuqhubeka kwalesi sigaba - uKostitsyn wabonakala okwesibili ngaphansi kweminyaka engama-20 eMqhudelwaneni Womhlaba Wama-Junior Ice Hockey ngo-2002  <response>: futhi washaya amagoli amathathu okusiza iBelarus ukuba ihlale esigabeni esiphezulu. Kamuva ngalowo nyaka, uKostitsyn wabuyela esigabeni esiphezulu ku-2002 IIHF World U18 Championships, waqopha amaphuzu ayi-10 emidlalweni eyisishiyagalombili futhi wasiza ukuhola iBelarus endaweni yesihlanu. Ukuncintisana emqhudelwaneni wakhe wesithathu ongaphansi kweminyaka engama-20 ku-2003 World Junior Ice Hockey Championships, uKostitsyn uqophe amagoli amabili kanye nokusiza okukodwa, kodwa wehliselwa eBelarus ku-Division-I ngo-2004. Ukudlala esigabeni sesibili, wafaka amagoli amahlanu namaphuzu ayi-10 emidlalweni emihlanu ukusiza iBelarus ukuthi ibuyele esigabeni esiphezulu ngo-2005, lapho athola khona amaphuzu amahlanu kumdlalo wakhe wesihlanu nowokugcina weWorld Juniors. 