Special Envoy for Yemen Martin Griffiths resumed in Saudi Arabia on Monday his efforts with the legitimate government to push forward Yemen’s peace process with Houthis. He also tackled the implementation of the Riyadh Agreement signed last December between the legitimacy and the Southern Transitional Council. Yemeni political sources told Asharq Al-Awsat that Griffiths held talks with advisors of Yemeni President Abd-Rabbu Mansour Hadi in Riyadh: Ahmed Obeid bin Daghr, Abdul Aziz Al Jabari and Yassin Makkawi. In a tweet posted on Monday, bin Daghr wrote that during his meeting with Griffiths, he stressed that positive steps were achieved while implementing the Riyadh Agreement thanks to the recommendations of Hadi and the Saudi mediation. The advisor added that works are underway to achieve the matrix of military and security withdrawals, a step that needs the cooperation of all parties, stressing that Aden is the city of peace and coexistence. Griffiths’ trip to Riyadh came as three European Union ambassadors are on a current visit to Sanaa where they should meet with Houthi leaders as part of the European effort to support the peace process in Yemen. The sources said that Griffiths seeks to resume peace talks over a comprehensive solution between the legitimacy and Houthi rebels, a step that Yemen’s government refuses to accept before the implementation of the Stockholm deal and the withdrawal of militias from the city of Hodeidah. Meanwhile, Yemeni official sources said that Foreign Minister Mohammed al-Hadrami met on Monday in Riyadh with Lise Grande, the UNs top humanitarian official in Yemen. Hadrami and Grande tackled the latest developments in the country and the challenges that UN organizations face while operating in Yemen, particularly obstacles placed by Houthis to hinder the efforts exerted by such organizations to ease the humanitarian crisis there. Hadrami condemned the terrorist militia attack that hit Marib on Saturday evening, leaving more than 100 people killed. He called it a "cowardly terrorist act that violates all religious and human customs and values.” For her part, Grande praised the legitimate government’s efforts to support humanitarian activities and the UN work in Yemen, asserting that the organization exerts all its efforts to ease and limit the burden of humanitarian crisis in the country.