39In that regard, 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 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 or her of the genuine enjoyment of the substance of the rights conferred by that status (judgment of 8 May 2018, K.A. and Others (Family reunification in Belgium), C‑82/16, EU:C:2018:308, paragraph 51).
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