The two Mideast powerhouses have been trying to block the rise of Islamist groups in the region for two decades. The rebel takeover in Damascus will test that approach.

A high-level delegation from Syria's transitional government visited Saudi Arabia on Thursday, marking their first foreign trip and signalling a warming of ties with the oil-rich monarchy. The team, including Syria's newly appointed Foreign Minister Asaad al-Shibani,

Last month, a Saudi delegation met Syria's new leader Ahmed al-Sharaa in Damascus, a source close to the Saudi government told AFP at the time. Sharaa heads the Islamist Hayat Tahrir al-Sham group that led the rebel offensive that ousted Assad on December 8.