Moderator Stephen Sackur, center, speaks with North Macedonia's Prime Minister Zoran Zaev, right, and Poland's President Andrzej Duda, left, during an event 'NATO Engages' at Central Hall Westminster 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. (AP Photo/Francisco Seco)