SHARE The UN envoy to Yemen, Martin Griffiths, complained on Wednesday that his efforts to end the country’s six-year conflict were not gaining traction, amid reports he will leave his post for a promotion within the UN. a ceasefire deal with Yemen’s government, which is backed by a Saudi Arabia-led military coalition. The council met amid reports that Mr Griffiths will soon replace Mark Lowcock as the UN’s humanitarian chief and emergency relief co-ordinator, after spending three years trying to bridge seemingly insurmountable differences between Yemen’s opposing groups . The latest round of peace talks ground to a halt without a truce after Houthi negotiators refused to meet Mr Griffiths in Oman and escalated their deadly assault on Marib, the government's last stronghold in northern Yemen, according to the US State Department.