<prompt> Qedela umusho olandelayo: Njengelungu leqembu laseSerbia elingaphansi kweminyaka engu-17, uRadonjić washaya amagoli ama-5 emidlalweni eyisithupha phakathi kuka-2012 no-2013, kufaka phakathi i-hat-trick emdlalweni neBelarus. Kamuva, ubeyilungu leqembu lesizwe labangu-18 nabangu-19. URadonjić wabizelwa eqenjini lesizwe laseSerbia U20 ngoNovemba 2016 ngumqeqeshi uNenad Lalatović, lapho enza i-debut yakhe eqenjini emdlalweni neMontenegro. Njengomqeqeshi weqembu laseSerbia U-21, uNenad Lalatović naye wammema eqenjini le-  <response>: Umqhudelwano WaseYurophu we-Under-21 ka-2017. NgoNovemba 2017, uRadonjić wamenyelwa eqenjini lebhola lezinyawo laseSerbia ohambweni lwase-Asia ngumnakekeli uMladen Krstajić. Wenza i-debut yakhe kwelaseSerbia emdlalweni wobungani neNingizimu Korea ngomhlaka 14 Novemba 2017, esikhundleni sika-Andrija Živković ngomzuzu wama-81 womdlalo. 