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U.S. Secretary of State Rex Tillerson waits for the start of a meeting last month at NATO headquarters in Brussels. Tillerson is scheduled to travel to Russia on Tuesday, in what promises to be a difficult round of talks after the U.S. missile strike in Syria last week. Virginia Mayo/AP hide caption

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Virginia Mayo/AP

President Obama and other leaders met in The Hague. Clockwise from bottom left: European Union Council President Herman Van Rompuy, Canadian Prime Minister Stephen Harper, French President Francois Hollande, British Prime Minister David Cameron, Obama, German Chancellor Angela Merkel, Japanese Prime Minister Shinzo Abe, Italian Prime Minister Matteo Renzi and EU President Jose Manuel Barroso. Sean Gallup/Getty Images hide caption

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Sean Gallup/Getty Images