Explained in plain English
What's been invoked before?
Article 5, NATO's collective defence clause, has only been formally invoked once. This happened after the 9/11 terrorist attacks on the United States in 2001. All NATO members then provided support, demonstrating the 'one for all, all for one' principle that Trump seems to be questioning with his demands for loyalty over money.
Stories that explain this
Trump tells NATO allies he wants loyalty, not moneyThis explainer came from a news story
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