In a double blow to the already frozen peace process, Lakhdar Brahimi announced his resignation yesterday at UN headquarters as French Foreign Minister Laurent Fabius spoke in Washington.
Fabius accused Bashar al-Assad's regime of resorting to banned chemical weapons 14 times in recent months, despite having agreed to hand-over its deadly stockpile to international monitors.
"How much more destruction is there going to be before Syria becomes again the Syria we have known?" Brahimi asked he confirmed weeks of rumors that he was stepping down.
The veteran Algerian diplomat, backed by the US and Western allies, had coaxed Assad and Syria's fractious opposition to attend peace talks in Geneva earlier this year.
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"He has faced almost impossible odds," Ban said of his 80-year-old envoy, promising to replace him.
Separately, Fabius told reporters in Washington that the 14 reported incidents showed that "in recent weeks, new, smaller quantities of chemical arms have been used, mainly chlorine."
A UN watchdog, the Organisation for the Prohibition of Chemical Weapons (OPCW), which is overseeing the removal of Syria's toxic arms, has sent a mission into the war-torn country to investigate.