Opposition groups in Syria have rejected the U.N. plan for a temporary ceasefire in the northern city of Aleppo. U.N. envoy Staffan de Mistura recently won a pledge from the regime of Bashar al-Assad to stop attacks on Aleppo for up to six weeks. But Aleppo’s Revolutionary Council says it will not meet with de Mistura unless he proposes a “comprehensive solution” based on Assad’s removal from power. This month marks the fourth anniversary of Syria’s civil war.