 Pari gbolohun ti o tẹle: Grigorenko ṣoju Russia fun igba akọkọ bi ọmọ ọdun 15 ni 2009 Ivan Hlinka Memorial Tournament nibi ti Russia pari keji. Ninu iṣẹ-ṣiṣe ọdọ ti kariaye pẹlu Russia, Grigorenko ṣe iranlọwọ fun Russia lati gba awọn ami-ẹyẹ mẹta ti o tẹle ni Awọn idije Agbaye Junior, pẹlu ami-ẹyẹ fadaka ni Ilu Kanada ni ọdun 2012 atẹle nipasẹ awọn ami-ẹyẹ idẹ meji ni Russia abinibi rẹ ni ọdun 2012. : 2013 àti Sweden ní ọdún 2014. 