30It should be noted with regard to the various national rules that the European Union legislator did not intend, by Article 11(2) of Annex VIII to the Staff Regulations, to harmonise the various national provisions in the field of pensions, which are characterised by a great diversity and complexity (see Commission v Luxembourg, paragraph 21). Moreover, as was stated by the Advocate General in point 43 of his Opinion, it follows from Article 48 TFEU and Article 153(4) TFEU that the right of the Member States to define the fundamental principles of their social security systems is recognised by European Union law.
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