55Compliance with that obligation is also necessary in order to ensure respect for the equality of Member States before the Treaties, which precludes the possibility of relying on, as against the EU legal order, a unilateral measure, whatever its nature (see, to that effect, judgment of 21 December 2021, Euro Box Promotion and Others, C‑357/19, C‑379/19, C‑547/19, C‑811/19 and C‑840/19, EU:C:2021:1034, paragraph 249), and constitutes an expression of the principle of sincere cooperation set out in Article 4(3) TEU, which requires any provision of national law which may be to the contrary to be disapplied, whether the latter is prior to or subsequent to the EU legal rule having direct effect (see, to that effect, judgments of 8 September 2010, Winner Wetten, C‑409/06, EU:C:2010:503, paragraph 55, and of 21 January 2021, Whiteland Import Export, C‑308/19, EU:C:2021:47, paragraph 31).
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