51In this connection, the Court has previously held that there are very specific situations in which, despite the fact that secondary law on the right of residence of third-country nationals does not apply and the Union citizen concerned has not made use of his freedom of movement, a right of residence must nevertheless be granted to a third-country national who is a family member of that Union citizen, since the effectiveness of Union citizenship would otherwise be undermined, if, as a consequence of refusal of such a right, that citizen would be obliged in practice to leave the territory of the European Union as a whole, thus depriving him of the genuine enjoyment of the substance of the rights conferred by that status (see, to that effect, judgments of 8 March 2011, Ruiz Zambrano, C‑34/09, EU:C:2011:124, paragraphs 43 and 44, and of 10 May 2017, Chavez-Vilchez and Others, C‑133/15, EU:C:2017:354, paragraph 63).
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