An official of the European Union Delegation in a third country manages a confidential database containing sensitive information about ongoing diplomatic negotiations. The Delegation needs to implement a cloud storage solution to facilitate secure real-time access to documents from multiple locations, ensuring that the data remains under the exclusive control of the EU and strictly complies with the data protection principles of the GDPR. According to EU governance principles and best cybersecurity practices for institutions such as the European External Action Service (EEAS), what is the most appropriate cloud strategy for this scenario?