Mironov akatanga kusarudzwa kuti atambe pamutambo wenyika yose nechikwata cheRussia chevadiki pasi pemakore gumi nemasere pa2012 IIHF World U18 Championships muCzech Republic. Akatamba mumitambo yose ye6 yeRussia pabhuruu munzira yekuenda kunopedzisa nzvimbo yechishanu. Mironov, akamiririra Russia pa2013 uye 2014 World Junior Championships
, achibatsira nyika yake kuwana menduru yebronze mumitambo miviri iyi apo achipa mapoinzi matanhatu mumakwikwi gumi nemana.