Prime Minister Boris Johnson has said there was a mood of "great solidarity and determination" at the conclusion of the Nato leaders summit.
It came at the end of a colourful two days which saw clashes between Donald Trump and Justin Trudeau.
Mr Trump called the Canadian Prime Minister "two faced" after a video surfaced of Mr Trudeau, Mr Johnson and French President Emmanuel Macron appearing to mock their US counterpart.
Later, Mr Trump confirmed he had cancelled a scheduled press conference and would return to Washington after he had finished his official meetings.
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