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Queen Mathilde and King Philippe of Belgium (R) welcome UN Secretary-General Antonio Guterres for a meeting and lunch at the Royal Castle in Laeken in Brussels on April 5, 2017, on the sidelines of a Syria conference at the European Council. / AFP PHOTO / Belga / BENOIT DOPPAGNE / Belgium OUT (Photo credit should read BENOIT DOPPAGNE/AFP/Getty Images)

Queen Mathilde and King Philippe of Belgium (R) welcome UN Secretary-General Antonio Guterres for a meeting and lunch at the Royal Castle in Laeken in Brussels on April 5, 2017, on the sidelines of a Syria conference at the European Council.  / AFP PHOTO / Belga / BENOIT DOPPAGNE / Belgium OUT        (Photo credit should read BENOIT DOPPAGNE/AFP/Getty Images)

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Queen Mathilde and King Philippe of Belgium (R) welcome UN Secretary-General Antonio Guterres for a meeting and lunch at the Royal Castle in Laeken in Brussels on April 5, 2017, on the sidelines of a Syria conference at the European Council. / AFP PHOTO / Belga / BENOIT DOPPAGNE / Belgium OUT (Photo credit should read BENOIT DOPPAGNE/AFP/Getty Images)

Queen Mathilde and King Philippe of Belgium (R) welcome UN Secretary-General Antonio Guterres for a meeting and lunch at the Royal Castle in Laeken in Brussels on April 5, 2017, on the sidelines of a Syria conference at the European Council.  / AFP PHOTO / Belga / BENOIT DOPPAGNE / Belgium OUT        (Photo credit should read BENOIT DOPPAGNE/AFP/Getty Images)