https://www.eeas.europa.eu/eeas/article-427-teu-eus-mutual-assistance-clause_en
Article 42(7) TEU - The EU's mutual assistance clause | EEAS
Article 42(7) TEU is the European Union’s mutual assistance clause. Once activated by an attacked Member State, all other Member States have to provide...
article 42the eumutualassistanceclause