The United Nations envoy to Yemen touched down in the southern port city of Aden on Saturday to discuss prospects for peace talks between the embattled Aden-based government and Houthi forces, a source close to Yemen's president said. Forces loyal to President Abd-Rabbu Mansour Hadi backed by mainly Gulf Arab states have been locked in eight months of civil war with the Iran-allied Houthis who rule the capital Sanaa. Previous U.N.-led efforts to solve the crisis through dialogue have failed as battles rage across the country and Saudi-led warplanes bomb positions of Yemen's ascendant Houthi group and its Yemeni army allies.