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allow the present appeal and set aside the judgment of the General Court of 23 September 2020 in Case T-370/19 brought against the European Commission;

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give judgment on the action for annulment by annulling Commission Decision of 18 March 2019 on the participation of the National Regulatory Authority of Kosovo in the Body of European Regulators for Electronic Communications (1), and

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in any event order the defendant to pay the costs.

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error of law in the interpretation of the concept of ‘third country’ within the meaning of Article 35 of Regulation 2018/1971 (2), in the light of the EU Treaties and of international law;

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error of law in the interpretation and application of Article 111 of the Kosovo SAA, in conjunction with Article 35 of Regulation 2018/1971, by misinterpreting the consequences of the European Union not taking a position on Kosovo’s status in international law;

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error of law in the interpretation of Article 35 of Regulation 2018/1971, in conjunction with Article 111 of the Kosovo SAA, in so far as the cooperation concerned does not include participation in BEREC and the Management Board of the BEREC Office;

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error of law in that it was held in the judgment under appeal that Article 17 TEU was a valid legal basis for adopting the contested decision;

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error of law in the interpretation of Article 35(2) of Regulation 2018/1971 in that it was held in the judgment under appeal that working arrangements could be laid down unilaterally by the European Commission.