A diplomatic crisis pitting Saudi Arabia against Qatar has put Syrian rebels in a difficult position, analysts say, after rivalries between Gulf backers had already weakened the opposition.
Both Sunni-ruled monarchies sided with the protesters in March 2011, when the war started with the brutal repression of anti-government demonstrations.
They continued supporting the mostly Sunni rebels when unrest spiralled into conflict between the armed opposition and troops loyal to President Bashar al-Assad, who hails from the country's Alawite Shiite minority and is backed by Saudi Arabia's arch-rival Iran.
But six years later, the rebellion has been plagued by rivalries between Riyadh and Doha, as well as weakened by Russia's military intervention in support of Assad's forces.
Opinion Video: Is the #Saudi-led 'siege' on #Qatar doomed? #QatarCrisis via @trtworld pic.twitter.com/q0sBCFUm5O — Emir-ul Qatar ?? (@EmirulQatar) June 13, 2017
"Qatar, Saudi Arabia, Turkey, Jordan and the United Arab Emirates have supported the revolution of the Syrian people and shown solidarity throughout years of tragedy," the rebel official said.
In a sign of the embarrassment the crisis is causing, several rebel groups refused to comment, saying it was a "sensitive" issue.
But Sayigh said the latest flare-up in relations between Qatar and Saudi Arabia will have a limited impact on the Syrian conflict.
"It probably won't have a major financial impact, nor a military one since the US and Turkey have stepped up their support for factions that previously were close to Qatar or to Saudi Arabia," Sayigh said.
Riyadh "reduced its funding sharply starting" from the summer of 2015 "after it launched its intervention in Yemen" earlier in the year, he said. Six years into the war, Syria's fractured rebellion controls just around 10 percent of the war-torn country, with backing from Saudi Arabia, Qatar, Turkey, Jordan and the United States. Pro-Doha rebels including the powerful Ahrar al-Sham group are present in the north of the country. In Eastern Ghouta, pro-Doha opposition groups exist alongside the pro-Riyadh Jaish al-Islam rebel alliance.
Is Saudi Arabia using its wealth and influence to force other countries to reduce diplomatic ties with Qatar? pic.twitter.com/lpPn2HSYrj— AJ+ (@ajplus) June 14, 2017
A summary of the #Saudi views into the #QatarCrisis #Qatar #Terrorism pic.twitter.com/PJHScFORji — The Qatar Insider (@theqatarinsider) June 15, 2017
Rebels in the south, meanwhile, are trained by Amman and Washington.
Another influential player is Syria's former Al-Qaeda affiliate, which now leads the Tahrir al-Sham group and which some analysts and Syrian factions say has links with Qatar, although Doha has denied this.