collective defence
military operations and other actions undertaken by the Allies under Article 5 of the Washington Treaty (and in exercise of the right of individual or collective self-defence recognized by Article 51 of the Charter of the United Nations) to assist any Ally or Allies subjected to armed attack …, liitlaste poliitiline ja sõjaline tegevus ning muud meetmed, mille eesmärk on abistada ühte või mitut liitlast, kelle vastu on toime pandud relvastatud rünnak