"As to parliamentary elections, the Court notes that the rights safeguarded by Article 3 of Protocol No. 1 are not absolute but subject to restrictions. The Contracting States have a wide margin of appreciation to make the right to vote subject to conditions, but it is for the Court to determine in the last resort whether the requirements of Protocol No. 1 have been complied with; it has to satisfy itself that the conditions do not curtail the rights in question to such an extent as to impair their very essence and deprive them of their effectiveness; that they are imposed in pursuit of a legitimate aim; and that the means employed are not disproportionate. In particular, such conditions must not thwart “the free expression of the opinion of the people in the choice of the legislature” (see the Mathieu-Mohin and Clerfayt v. Belgium judgment of 2 March 1987, Series A no. 113, p. 23, § 52, and Matthews v. the United Kingdom [GC], no. 24833/94, § 63, ECHR 1999-I). "
CoE (ECHR): Case of Hilbe v. Liechtenstein, page 3

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Case of Hilbe v. Liechtenstein