Shunned by the West, Assad has been basking in an outpouring of support from Arab states that have normalised ties with him in recent years, notably the United Arab Emirates (UAE).
On Tuesday, Saudi Arabia sent its first reported plane of aid to Assad-controlled Aleppo, a notable gesture from a Gulf state still at odds with Syria's president.
'BREAK THE SIEGE'The UAE has pledged $50 million in aid to Syria, without saying in which part of Syria it will be spent.
Once a backer of Assad's foes, the UAE has been pressing other Arab states to re-engage with Damascus, according to two Gulf sources, despite opposition from its strategic ally the United States.
Tunisia, which cut off ties with Syria a decade ago, has said it will strengthen relations with Damascus since the quake.