In Yemen, the United Arab Emirates is being accused of bombing Saudi-backed Yemeni forces and killing as many as 40 people, as a new front in the Yemen war intensifies. For years, the UAE and the Saudis were on the same side as they targeted Houthi rebels. But now the Gulf states find themselves on opposing sides in a separate battle for the control of Aden, Yemen’s interim capital. The UAE has been backing a group of separatists, while the Saudis back the government forces.