After today's meetings, adjourned at noon after the envoy met with the two sides "simultaneously" this morning, Brahimi told a press conference that the negotiations were as "laborious" as the first round did, Xinhua reported.
"We are not making much progress," he said, appealing to speed up actions to make this process a reality and help lift Syria out of the mire."We will do our very best to make this process take off."
The mediator stressed that to push forward the process requires both the cooperation from the two warring sides and the supports from outside.
On the UN-Russia-US meeting scheduled to be held on Friday, Brahimi said it is a "consultative" and "routine" meeting between himself, Russia and the US, the two initiating sides for the Geneva II conference on Syria.
But he did not reveal the agenda or details of the upcoming trilateral meeting.