 Nyora kuenderera mberi kweiyi ndima - Kostin akaita kutanga kwake kwenyika ku2016 IIHF World U18 Championships, achishanda semutungamiriri wechikwata cheRussia cheU-18. Akanyora mana anobatsira mumitambo mishanu sezvo timu yakapedza yechitanhatu. Gare gare gore iroro akabatanidzwa mu2016 Ivan Hlinka Memorial Tournament, mutambo wepasi pemakore gumi nemasere usingabvumirwe neInternational Ice Hockey Federation asi unofungidzirwa semutambo wepamusoro weboka rezera. Zvakare kaputeni wechikwata, aive nezvinangwa zvina uye matatu anobatsira mumitambo mishanu sezvo timu yakahwina menduru yebronze. Akatambawo mu a hrefCHL20CanadaRussia20SeriesCHL CanadaRussia Seriesa, mutambo wepagore pakati peCHL All-Star zvikwata uye yeRussia yenyika junior timu, achiwana mapoinzi maviri mumitambo mishanu. 