A diplomat from the European Union Delegation in a third country, working under the supervision of the European External Action Service (EEAS), needs to share a confidential document containing personal data of EU citizens regarding an external policy initiative. The document must be processed and temporarily stored on a cloud computing platform of a third-party provider located in a country that has not been recognized by the European Commission as ensuring an adequate level of data protection. According to the fundamental principles of the GDPR and the EU's data protection framework, what is the safest and compliant action to manage this data flow without violating the regulation, assuming that no EU-based provider can be used at this specific moment?