The UN envoy for Yemen warned that the risk of a return to fighting “is real,” urging warring parties to accept a longer extension of the current ceasefire due to expire next month. Hans Grundberg’s stark warning late Tuesday came after he met in Saudi Arabia’s capital, Riyadh, with Rashad al-Alimi, head of the internationally recognised presidential council, and in Oman’s capital of Muscat with Mohammed Abdul-Salam, the chief negotiator of the Houthi rebels. He also met with Saudi and Omani officials to push for a cease-fire extension. Grundberg said in a statement he discussed a UN proposal …