Judgment_paragraph 129 · Hungary v European Parliament and Council of the European Union (C-156/21)

129In that regard, it should be noted, first, that the Union budget is one of the principal instruments for giving practical effect, in the Union’s policies and activities, to the principle of solidarity, mentioned in Article 2 TEU, which is itself one of the fundamental principles of EU law (see, by analogy, judgment of 15 July 2021, Germany v Poland, C‑848/19 P, EU:C:2021:598, paragraph 38), and, secondly, that the implementation of that principle, through the Union budget, is based on mutual trust between the Member States in the responsible use of the common resources included in that budget. That mutual trust is itself based, as stated in paragraph 125 above, on the commitment of each Member State to comply with its obligations under EU law and to continue to comply, as is moreover stated in recital 5 of the contested regulation, with the values contained in Article 2 TEU, which include the value of the rule of law.