Two former German soldiers attempted to set up a paramilitary unit of 100 to 150 people in order to take control of an area held by the Houthi rebels in Yemen.
UN special Yemeni envoy said warring sides failed to agree on an extension to a ceasefire in the Middle Eastern country.
Two separate attacks on Yemen's Zinjibar and Ataq leave nine soldiers dead while three other militants were also killed in the gunfire.
The International Committee of the Red Cross has facilitated the release and repatriation of nearly 100 Yemeni prisoners.
Riyadh cut ties with Tehran in 2016 after Iranian protesters attacked Saudi diplomatic missions in Iran after the kingdom executed Shia cleric Nimr al Nimr.
Hans Grundberg is scheduled to meet Houthi rebel officials during his first Sanaa visit since taking office in September.
The UN said the emergency part of a two-stage operation would see the toxic cargo pumped from the storage platform to a temporary replacement vessel at a cost of $79.6 million.
During the two-month truce, the Saudi-led coalition will allow 18 vessels carrying fuel into the port of Hodeida, and two commercial flights a week from the Yemeni capital to Jordan.
The Houthi rebels said the peace initiative could be a lasting commitment if the Saudi-led coalition fighting in Yemen stopped air strikes and lifted port restrictions.
After hours of talks with the pilots, team principals and Saudi officials, Formula One and governing body the FIA said it received "assurances" that the race in Jeddah can be held safely.
Saudi-led coalition has said attacks targeted Aramco's water desalination plant and power station in the southern city of the kingdom, and a gas facility in Khamis Mushait.
"One of the world's gravest global humanitarian catastrophes" in Yemen has left 19 million people facing hunger this year, including 160,000 likely to face "famine-like conditions," UN humanitarian chief Martin Griffiths tells UNSC.
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