Britain's Queen Elizabeth talks to guests during a reception at Buckingham Palace, as NATO leaders gather to mark 70 years of the alliance, in London, Tuesday, Dec. 3, 2019. U.S. President Donald Trump and his NATO counterparts were gathering in London Tuesday to mark the alliance's 70th birthday amid deep tensions as spats between leaders expose a lack of unity that risks undermining military organization's credibility. (Yui Mok/Pool Photo via AP)

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