File picture of US Secretary of State John Kerry.
"I pressed that we must see the last removal of the 8 percent remaining at a site near Damascus," Kerry told reporters, saying the telephone conversation took place during his flight to Democratic Republic of Congo.
"We agreed that we would work on certain things to try to see if it is possible to accelerate that process with an understanding that the government of Syria cannot delay," he said, without elaborating.
Syria has been removing 1,300 tonnes of chemical weapons under a deal reached last year which averted Western military strikes, after a sarin gas attack on rebel-held suburbs around the Syrian capital in August.
But it has missed several deadlines to ship out the toxins - the last of which was April 27 - and has told the international mission overseeing the operation that one remaining chemical site remains difficult to reach because of the fighting.
Assad's Western foes suspect him of deliberately dragging out the process, but a rebel advance east of Damascus suggests there are genuine obstacles to getting the chemicals out.
Still, Kerry put the onus on the Syrian government to prepare the weapons for removal.
"The regime must move immediately to prepare those remaining chemical weapons for removal and we need to meet that removal as fast as possible," he said.
© Thomson Reuters 2014
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