There is ne moment is this heartbreaking scene between Ilya and his father (by the way, it seems to me, that Ilya loves him and really cares), before meeting the minister in Sochi, then you realise, that all his father's grumbling and nagging - it mostly dementia speaking - when Grigoriy, after Ilya reminds him, who they are meeting with, suddenly "wakes up". I dont know, if actor/director choose to do it or it hapoened unintentionally - this moment when he looks at his son with alive amused eyes and speaks consious voice - about 3-4 seconds, but its enough for Ilya's love looks more explainable.











