Syrian opposition leader Moaz al-Khatib has resigned to denounce 'international community's lack of real action'Syria's opposition has reacted angrily to the refusal by the US and its western allies to do more to help, amid signs Bashar al-Assad's regime is gaining ground in the international debate about how to handle the country's two-year crisis.Moaz al-Khatib, leader of the mainstream National Opposition Coalition (NOC), the rebel group backed by Arab and western governments, registered his dismay by confirming on Sunday that his resignation - first announced nearly a month ago but not implemented - was now final.