Syrian President Bashar Assad is seeking political advantage from an earthquake that has devastated large parts of Syria and Turkey, pressing for foreign aid to be delivered through his territory as he aims to chip away at his international isolation, analysts say.

Amid an outpouring of sympathy for the Syrians hit by the earthquake, Damascus has seized the moment to reiterate its long-standing demand for aid to be coordinated with his government, shunned by the West since Syria's war began in 2011.

Western powers have shown no sign they are ready to meet that demand or re-engage with Assad, but his hand has been strengthened by difficulties faced by cross-border aid flowing from Turkey into Syria's rebel-held northwest.