Explained in plain English
What is collective defence?
Collective defence is the core principle of NATO, meaning an attack on one member is considered an attack on all. It obliges every member to come to the aid of any ally under attack. This is why Trump's demand for 'loyalty' over military spending is so controversial, as it challenges the very foundation of how NATO operates.
Stories that explain this
Trump tells NATO allies he wants loyalty, not moneyQuestions this opens up
Who protects whom? What does Article 5 mean? When was it first used?This explainer came from a news story
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