LONDON: The UN envoy to Yemen Martin Griffiths was in Saudi Arabia on Monday for a series of meetings with Yemeni and Saudi officials, according to a UN spokesman. His visit comes as part of the organization’s efforts in seeking a nationwide ceasefire in Yemen, alleviate the humanitarian suffering, and resume the political process toward peace, the spokesman added. On Sunday, Griffiths confirmed a round of Yemeni prisoner exchange talks ended with no agreement reached between warring parties, saying: “Although the parties did not agree to releases during this round of talks, they committed to keep discussing the parameters of a future expanded release operation.” And last week, Griffiths said Houthi militia assaults on the Yemeni government’s last northern stronghold Marib must stop, while warning of a potential humanitarian disaster if hostilities did not cease.