31In the main proceedings, Mr Petruhhin, an Estonian national, made use, in his capacity as a Union citizen, of his right to move freely within the European Union by moving to Latvia, so that the situation at issue in the main proceedings falls within the scope of application of the Treaties, within the meaning of Article 18 TFEU, which sets out the principle of non-discrimination on grounds of nationality (see, to that effect, judgment of 2 February 1989 in Cowan, 186/87, EU:C:1989:47, paragraphs 17 to 19).
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