It does - https://en.wikipedia.org/wiki/Common_Security_and_Defence_Policy https://en.wikipedia.org/wiki/Common_Security_and_Defence_Po... Article 42: > 7. If

It does - https://en.wikipedia.org/wiki/Common_Security_and_Defence_Policy https://en.wikipedia.org/wiki/Common_Security_and_Defence_Po... Article 42: > 7. If a Member State is the victim of armed aggression on its territory, the other Member States shall have towards it an obligation of aid and assistance by all the means in their power, in accordance with Article 51 of the United Nations Charter. This shall not prejudice the specific character of the security and defence policy of certain Member States. It's basically like Article 5 but for the EU.