Artikel 28

1. After the entry into force of this Agreement, the Committee of Ministers of the Council of Europe, after consulting the Contracting States to the Agreement, may invite any State which is not a member of the Council but which has expressed its consent to be bound by the Vienna Convention to accede to this Agreement, by a decision taken by the majority provided for in Article 20.d of the Statute of the Council of Europe and by the unanimous vote of the representatives of the Contracting States entitled to sit on the Committee.
2. In respect of any acceding State, the Agreement shall enter into force on the first day of the month following the expiry of a period of three months after the date of deposit of the instrument of accession with the Secretary General of the Council of Europe.