Speech by King Willem-Alexander at the state banquet hosted in Keila-Joa Castle by President Kersti Kaljulaid of Estonia | Royal House of the Netherlands https://www.royal-house.nl/documents/2018/06/12/speech-by-king-willem-alexander-at-the-state-banquet-hosted-in-keila-joa-castle-by-president-kersti-kaljulaid-of-estonia
The customs union between Estonia and Latvia in the early 1920s served as the model
