Trump's Russia threat against NATO: What US allies are spending on defence

I told one of the leaders of a big country... I said, 'Listen, you’re not spending enough. You're not paying your bills.' I said, 'I'm sorry, I can’t protect you if that happens'

NATO defence spending declined sharply after the Cold War... To boost funding, members agreed at a 2014 summit in Wales to contribute at least 2 percent of their GDPs to the alliance by 2024.

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