There has been a lot of talk in the past few hours about NATO’s Articles 4 and 5, which form part of the alliance’s 1949 founding treaty.
It is important to note that NATO makes its decisions “by consensus after discussion and consultation“.
Article 4
Under Article 4, member countries can bring an issue to the attention of NATO’s political decision-making body and discuss it with its allies in the grouping,
The article states:
“The Parties will consult together whenever, in the opinion of any of them, the territorial integrity, political independence or security of any of the Parties is threatened.”
In effect it is a preparatory article for Article 5 and has been used seven times since NATO was founded. A number of east European members, including Poland, requested consultations on February 24 after Russia invaded Ukraine. Turkey also invoked Article 4 a number of times.
Article 5
Article 5 represents NATO’s commitment to collective defence.
“The Parties agree that an armed attack against one or more of them in Europe or North America shall be considered an attack against them all and consequently they agree that, if such an armed attack occurs, each of them, in exercise of the right of individual or collective self-defence recognised by Article 51 of the Charter of the United Nations, will assist the Party or Parties so attacked by taking forthwith, individually and in concert with the other Parties, such action as it deems necessary, including the use of armed force, to restore and maintain the security of the North Atlantic area.
Any such armed attack and all measures taken as a result thereof shall immediately be reported to the Security Council. Such measures shall be terminated when the Security Council has taken the measures necessary to restore and maintain international peace and security”.