An armed Yemeni man holds a rocket launcher as people gather in the capital Sanaa to show their support to the Shiite Huthi movement against the Saudi-led intervention, on December 19, 2018. - A hard-won truce in the battleground Yemeni city of Hodeida will collapse if rebel violations persist and the United Nations does not intervene, the Saudi-led coalition said on December 19. UN observers are due in Yemen to head up monitoring teams made up of government and rebel representatives tasked with overseeing the implementation of the UN-brokered ceasefire that took effect on Tuesday. (Photo by Mohammed HUWAIS / AFP) (Photo credit should read MOHAMMED HUWAIS/AFP via Getty Images)