What is Article 42.7 of the Lisbon Treaty?

Article 42.7 is the solidarity clause that states that if a member of the European Union is the victim of “armed aggression on its territory” other states have an “obligation of aid and assistance by all the means in their power.”Article 42.7 is the solidarity clause that states that if a member of the European Union is the victim of “armed aggression on its territory” other states have an “obligation of aid and assistance by all the means in their power.”