The international peace conference in Syria has been delayed after initial hopes for a meeting this month. On Tuesday, U.N. envoy Lakhdar Brahimi said the United States and Russia have failed to agree on key details including participants and when the meeting would take place. Brahimi also said Syria’s opposition faces continued divisions.

Lakhdar Brahimi: “We were hoping that we would be in a position to announce a date today. Unfortunately, we are not. But we are still striving to see if we can have the conference before the end of the year. The opposition has a very, very difficult time. They are divided. It’s no secret for anybody. And they are facing all sorts of problems, and they are working very, very hard to get ready. And they are not ready.”