Judgment of the Court (Second Chamber) of 4 June 2026.#R.S. v Minister for Justice.#Request for a preliminary ruling from the Court of Appeal.#Reference for a preliminary ruling – Citizenship of the Union – Right to move and reside freely in the territory of the Member States – Directive 2004/38/EC – Article 3(1) – Beneficiaries – Family members of a Union citizen – Derived right of residence of a third-country national – Subsequent naturalisation of that national – Article 35 – Fraud or abuse of rights – Marriage of convenience – Temporal scope – Power of investigation of the competent national authorities into the existence of a marriage of convenience.#Case C-560/24.