Explained in plain English

What is Article 5?

Article 5 is NATO's cornerstone: an attack on one member is an attack on all. It means if a country like Turkey, where the summit is, was attacked, all other NATO nations would come to its defence. This commitment to mutual defence is what makes Trump's demand for 'loyalty' so controversial.

Stories that explain this

Trump tells NATO allies he wants loyalty, not money

Questions this opens up

Has Article 5 been used? What is collective defence? Who founded NATO?

Related explainers

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