Artikel 28

1. This framework Convention shall enter into force on the first day of the month following the expiration of a period of three months after the date on which twelve member States of the Council of Europe have expressed their consent to be bound by the Convention in accordance with the provisions of Article 27.
2. In respect of any member State which subsequently expresses its consent to be bound by it, the framework Convention shall enter into force on the first day of the month following the expiration of a period of three months after the date of the deposit of the instrument of ratification, acceptance or approval.