Artikel 18

1. This Convention shall enter into force thirty (30) days after the date of receipt of the final notification in which the Parties inform each other, through diplomatic channels, that they have fulfilled the requirements of their domestic legislation, and shall remain in force indefinitely.
2. With regard to the Kingdom of the Netherlands, this Convention shall apply to the European part of the Netherlands, the Caribbean part of the Netherlands (the islands of Bonaire, Sint Eustatius and Saba), Aruba, Curaçao and Sint Maarten, unless the notification referred to in paragraph 1 of this Article provides otherwise. In the latter case the Kingdom of the Netherlands may extend the application of this Convention at any time to one or more of its constituent parts by notification to the Republic of Cuba through diplomatic channels.