Rubuta ci gaba don wannan sakin layi - A matakin matasa matasa, Kulboka ya wakilci Lithuania a matakin kasa da kasa a lokuta da dama, ciki har da gasar FIBA ta Turai a karkashin 16 a shekarar 2014 da FIBA ta Turai a karkashin 18 a shekarar 2015. Ya zira kwallaye 15.7 a wasan a gasar 2016 FIBA Turai Under-18 Championship, a kan hanyar zuwa lambar azurfa. Ya kuma yi gasa ga Lithuania a gasar cin kofin kwallon kwando ta FIBA ta kasa da shekaru 19 a shekarar 2017
, yana da matsakaicin maki 13.7 a kowace gasa. A ranar 26 ga Fabrairun 2018, Kulboka ya fara aiki a matsayin memba na babbar kungiyar 'yan wasan kasar Lithuania, ta hanyar zira kwallaye tara, ya kama kwallaye biyar kuma ya ba da taimako biyu, kuma ya taimaka wajen murkushe kungiyar' yan wasan Kosovo, da ci 106<unk>50, a lokacin gasar cin kofin kwallon kwando ta FIBA ta 2019.