Nato summit

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Boris Johnson arrives at Nato meeting

Boris Johnson
Getty Images

The prime minister arrived at the Nato leaders meeting in Watford earlier this morning, which marks the 70th anniversary of the alliance.

Speaking on the way in, Prime Minister Boris Johnson said Nato continued to provide "peace and prosperity for hundreds of millions of people" because of "a very simple concept of safety in numbers."

"At the heart of it is a pledge that we will come to one another's defence - all for one and one for all."

But Mr Johnson warned Nato "cannot be complacent". He said the UK would continue to invest 2% of its GDP in defence and its commitment to the alliance was "absolutely rock solid".