69As regards the second factor, the Court has stated that it is the relationship of dependency between the Union citizen who is a minor and the third country national who is refused a right of residence that is liable to jeopardise the effectiveness of Union citizenship, since it is that dependency that would lead to the Union citizen being obliged, in practice, to leave not only the territory of the Member State of which he is a national but also that of the European Union as a whole, as a consequence of such a refusal (see, to that effect, judgments of 8 March 2011, Ruiz Zambrano, C‑34/09, EU:C:2011:124, paragraphs 43 and 45; of 15 November 2011, Dereci and Others, C‑256/11, EU:C:2011:734, paragraphs 65 to 67; and of 6 December 2012, O and Others, C‑356/11 and C‑357/11, EU:C:2012:776, paragraph 56).
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