Supporters of southern Yemen's separatist movement have taken to the streets in Aden to protest at an ultimatum delivered by Saudi Arabia to the group's main backer, the United Arab Emirates. The UAE said on Tuesday it would abide by a Saudi demand to end its military involvement in Yemen. Riyadh has been angered by separatist advances towards the Saudi border. Overnight on Monday, a Saudi-led strike force attacked a port in southern Yemen, where Riyadh said two UAE ships had docked with weapons for the separatists. The UAE has denied this.

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(Photo: The UAE-backed Southern Transitional Council (STC) seeks independence for southern Yemen. Credit: Photo by Najeeb Mohamed/EPA/Shutterstock)