The Vienna talks ended with the opposition saying it would not attend a Syrian peace congress that Russian Federation is holding next week in Sochi.
A spokesman for the main opposition said his group will boycott the Sochi conference.
The 9th round of UN-mediated talks between Syria's warring factions came to an end in Austria's capital Vienna on Friday with no tangible progress.
"This round of negotiations was an global test for the regime, and the test ended yesterday (Friday)", the opposition Syrian Negotiation Commission's Nasr al-Hariri told reporters in Vienna Saturday.
The cease-fire ended a two-month escalation between government forces and rebels in the Eastern Ghouta region. Ahead of the planned conference in Sochi, Yahya Al-Aridi said:"We listened to many guarantees concerning commitment, but none of them were delivered somehow and we are exhausted of that, we need real involvement, we need real commitment".More news: Spain Threatens to Arrest Puigdemont Over Copenhagen Visit
The three key regional players have been sponsoring parallel peace talks since the start of a year ago that have looked to still the fighting. Turkey has poured troops into the north to fight Kurdish militias that have established regional autonomy and are seen by Ankara as a menace to its security.
The document's recommendations included "a specific and immediate focus on discussion of a reformed constitution and organization of free and fair elections", language that was echoed by the opposition delegation in Vienna.
The special envoy first talked with the government delegation led by Bashar al-Ja'afarii at 11:30 for hours before the opposition delegation arrived.
"The goal of the conference in Sochi is to engage in a national intra-Syrian dialogue without foreign interference". Only 60,000 of the 2.5 million Syrians in "hard to reach" areas had received humanitarian aid, the United Nations chief said in his report on the humanitarian situation in Syria delivered Friday to the Security Council.
The opposition scheduled a news conference for 0900 GMT on Saturday.