United Nations Special Envoy for Yemen Martin Griffiths warned that the "military and political situation" in the southwestern Yemeni city of Taiz is "extremely complex and fragile," while speaking during a UN Security Council meeting on Monday in New York City.
Griffiths also spoke of "concerns" and "frustrations", saying he was "disappointed" with some elements of the implementation of the ceasefire agreement in Hodeidah.
Despite some good signs, including a reduction by 68 percent of the civilian casualties since the start of the ceasefire in December, Griffiths warned the UNSC of risks associated with the fragile situation in Yemen.
"This council has recently expressed concern at re-escalating violence across Yemen, and the attacks on civilian infrastructure in southern Saudi Arabia. I must echo these concerns," he said. "I have repeatedly warned that war can take peace off the table, and in the context of wider regional tensions, the risks to the political process have never looked more stark."
The conflict in Yemen, which began in 2015 between the Houthis and the Saudi-backed Hadi government, has killed tens of thousands and left the country's economy in ruins. According to recent UN reports, almost 80 per cent of the Yemeni population – some 24 million people – are in need of assistance and protection, with millions facing starvation.