About | Nato Article 5
What is Article 5?
Article 5 states that if a Nato ally is the victim of an armed attack, each and every other member of the alliance will consider this act of violence as an armed attack against all members and will take the actions it deems necessary to assist the ally attacked.
When has Article 5 been invoked?
On the evening of 12 September 2001, less than 24 hours after the 9/11 attacks, and for the first time in Nato’s history, the allies invoked the principle of Article 5.
After 9/11, there were consultations among the allies and collective action was decided by the Council. The United States could also carry out independent actions, consistent with its rights and obligations under the United Nations Charter.
On 4 October, once it had been determined that the attacks came from abroad, Nato agreed on a package of eight measures to support the United States.
On the request of the United States, it launched its first ever anti-terror operation – Eagle Assist – from mid-October 2001 to mid-May 2002. It consisted of seven Nato AWACS radar aircraft that helped patrol the skies over the United States; in total 830 crew members from 13 Nato countries flew over 360 sorties.
This was the first time that Nato military assets were deployed in support of an Article 5 operation.