UN said more than 11 million Yemeni children need humanitarian aid as a result of a war raging since March<br/>2015. <br/>'<br/>The UN's humanitarian coordination agency OCHA, which described the conflict as "devastating" said that children are facing the largest food security crisis in the world and an unprecedented cholera outbreak.<br/>'<br/>A Saudi-led Arab military coalition intervened in Yemen in 2015 to support the government of President Abedrabbo Mansour Hadi after Iran-backed Huthi rebels forced him into exile. '<br/><br/>The United Nations has listed Yemen as the world's number one humanitarian crisis, with seven million people on the brink of famine and a cholera outbreak that has caused more than 2,000 deaths.