99In that regard, the EU institutions enjoy broad discretion in policy decisions in the conduct of external relations (see, to that effect, judgment of 21 December 2016, Swiss International Air Lines, C‑272/15, EU:C:2016:993, paragraph 24). In the exercise of their prerogatives in that area, those institutions may enter into international agreements based, inter alia, on the principle of reciprocity and mutual advantages. Thus, they are not required to grant, unilaterally, third-country nationals rights such as the right to vote and to stand as a candidate in municipal elections in the Member State of residence, which, moreover, is reserved solely to Union citizens, under Article 20(2)(b) TFEU, Article 22 TFEU and Article 40 of the Charter.
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