Syrian rebels have ignited a new front outside the capital, Damascus, in the first significant fighting there since regime forces swept over the suburbs weeks ago. The clashes highlight the shifting nature of Syria's conflict, with rebels lying in wait to rise up when the regime turns its guns elsewhere. The return of violence to the Damascus suburbs on Friday raises questions about how long troops can control areas before they re-erupt. Though government forces have shown they can crushed armed fighters, the regime has appeared unable to conduct major offensives in more than one place at once. That points to the likelihood that a conflict that is now a year old and is estimated to have killed more than 8,000 could grind on as it slides closer to a civil war. Diplomatic efforts have so far brought no result, but UN envoy Kofi Annan told the Security Council in a briefing Friday that he was determined to continue his mission and would return to Damascus. Talks last week between Annan and Syrian President Bashar Assad in Damascus saw no progress in attempts to cobble together peace talks between the two sides. After the confidential briefing via videolink, Annan told reporters in Geneva that he urged the council “to speak with one voice as we try to resolve the crisis in Syria.” Russia and China have blocked council action against Assad's regime. “The first objective is for all of us to end the violence and human rights abuses and the killings and get unimpeded access for humanitarian access to the needy, and of course the all-important issue of political process that will lead to a democratic Syria,” Annan said. Both Assad and much of the opposition spurned Annan's appeal for talks.