Syria imposes curfew after its worst clashes since the Assad regime ouster / Syria risks relapsing into chaos amid US sanctions, infighting / Israel will not let use Syria's territory for attacks on it -- Netanyahu / Future of US bases in Syria under discussion -- Syrian authorities / Russia tight-lipped on Syrian demand of al-Assad for military bases / US relaxes Syria restrictions but keeps sanctions intact / Syria's Suwayseh residents demand end to Israel's illegal occupation / US pauses select restrictions on Syria, offering hope on Western sanctions / Health needs in Syria worsen amid winter conditions / Syrian development help prevent regional war -- Syria's new leader