The United Nations envoy for Syria announced on Wednesday he will step down at the end of November after more than four years in the key post, setting back UN efforts to end the seven-year war in Syria.
"I will myself be moving on as of the last week of November," Staffan de Mistura told the UN Security Council during a meeting on the crisis in Syria.
The Italian-Swedish diplomat, who became the UN's third Syria envoy in July 2014, said he was leaving for "purely personal reasons" and had discussed his plans to leave with UN Secretary-General Antonio Guterres.
De Mistura will be traveling to Damascus next week to push for the creation of a committee to agree on a post-war constitution for Syria.
Syria is resisting the UN-led effort to set up a constitutional committee that will be comprised of government officials, opposition members and representatives of civil society.
"I am not laying down the charge until the last hour of the last day of my mandate," he said.
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De Mistura was appointed UN envoy for Syria in July 2014 after veteran Algerian diplomat Lakhdar Brahimi resigned following the failure of peace talks in Geneva.
Brahimi spent two years in the position, stepping in after former UN chief Kofi Annan quit just six months into the role. Annan had described the Syria envoy's job as "mission impossible."
De Mistura's departure will complicate UN peace efforts at a time when the Syrian government is continuing to make territorial gains, opening up prospects for a political settlement to end the war.
More than 360,000 people have died in the war in Syria, which began in March 2011 as an uprising against President Bashar al-Assad but has since morphed into a complex war with myriad armed groups, some of which have foreign backing.
Among the names being floated as a possible successor are the UN's Middle East peace coordinator Nickolay Mladenov and the UN envoy for Iraq Jan Kubic, according to UN diplomats.
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