The United States has strongly backed a move by Syria's opposition chief to open dialogue with President Bashar al-Assad's regime in a bid to end 22 months of warfare that has cost tens of thousands of lives.
Syrian regime forces take position following clashes with rebels in the northern city of Aleppo on February 3, 2013. Syria's opposition chief has urged President Bashar al-Assad's regime to respond positively to his call for talks to end almost two years of violence which has left more than 60,000 people dead.
Ahmed Moaz al-Khatib, the leader of the Syrian Opposition Coalition, told pan-Arab television channel Al-Jazeera that "the ball is now in the regime's court. They will either say yes or no."