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Riad Hijab, head of the Syrian High Negotiation Committee (HNC) gives a statement to the press at the foreign ministry's guest house Villa Borsig in the suburbs of Berlin on May 4, 2016 ahead of a meeting on Syria as concerns grow over the war-torn country's faltering truce. / AFP / Adam BERRY (Photo credit should read ADAM BERRY/AFP/Getty Images)

Riad Hijab, head of the Syrian High Negotiation Committee (HNC) gives a statement to the press at the foreign ministry's guest house Villa Borsig in the suburbs of Berlin on May 4, 2016 ahead of a meeting on Syria as concerns grow over the war-torn country's faltering truce.  / AFP / Adam BERRY        (Photo credit should read ADAM BERRY/AFP/Getty Images)