Saudi Foreign Minister Saud al-Faisal made his comments on Sunday as the United States awaits a final decision on strikes against the Syrian government for an alleged chemical gas attack that killed hundreds of civilians.
"We call upon the international community with all its power to stop this aggression against the Syrian people," Faisal said in Cairo, where he was attending a meeting of Arab League foreign ministers to discuss Syria.
On the prospect of a US strike, he said: "We stand by the will of the Syrian people. They know best their interests, so whatever they accept, we accept, and whatever they refuse, we refuse."
The Arab League meeting was expected formally to blame Assad for the gas attack.
Al Jazeera's Nadim Baba, reporting from Cairo, said that Ahmed Aljarba, the head of the opposition Syrian National Council (SNC), would give a speech at the meeting of foreign ministers.
The head of the opposition umbrella group backed by the West and Arab states is expected to ask Arab foreign ministers to back military intervention in Syria.
The Arab League last week had accused the Syrian government of carrying out the chemical-weapons attacks in a suburb of Damascus on August 21.
The Arab League suspended Syria's membership in 2011 after President Bashar al-Assad's government failed to abide by an Arab peace plan that aimed to end the conflict.
The 22-member organisation offered in March Syria's seat to the SNC and decided to let its member nations arm the rebels battling Assad's government.
John Kerry, the US Secretary of State, named the regional body on Friday among a list of allies "ready to respond" to the alleged chemical-weapons attack.
However, some influential Arab League members, including Egypt, Iraq, Lebanon, Tunisia and Algeria, have expressed opposition to foreign military intervention in Syria.
'Syria capable of confronting attack'
Syrian President Bashar al-Assad has said that his country is capable of confronting any external attack, a day after his US counterpart Barack Obama called for military action against him.
"Syria ... is capable of confronting any external aggression," state television quoted Assad as saying on Sunday at a meeting with Iranian officials.
"The American threats of launching an attack against Syria will not discourage Syria away from its principles ... or its fight against terrorism supported by some regional and Western countries, first and foremost the United States of America."
Syria generally refers to rebels fighting to topple Assad as "terrorists".
The comments came as John Kerry, the US Secretary of State, said his government had obtained evidence that sarin gas was used in an attack in Syria last month that the US claims killed 1,400 people.
Hair and blood samples provided to the US from first responders on the scene of last month's attack in Damascus "have tested positive for signatures of sarin," Kerry told NBC and CNN television on Sunday.
Kerry said the "case is building'' for a military attack against the regime of Assad. However, the evidence has yet to be presented to the public.
The Assad regime is known to have stockpiles of sarin, a deadly nerve agent, although the regime has claimed that rebels have used the substance in attacks.
The statements come a day after Obama stepped back from his threat to launch an attack unilaterally, instead saying he would consult the US Congress before any such action.
Obama said on Saturday that the US had presented a "powerful case" linking the Assad regime to the attack in Ghouta on August 21, and that the US military was prepared to launch a "limited" strike.
Congress is due back from its summer recess on September 9.
A French government source meanwhile told the AFP news agency that officials would soon declassify secret defence documents detailing Syria's chemical arsenal.
The comment came after the French Journal du Dimanche newspaper said Syria had 1,000 tonnes of chemicals including sarin and mustard gas, and was developing a powerful agent that was far more toxic than sarin.
"The citations from the notes are correct," the source said. "The government plans to make public the declassified documents on the Syrian chemical arms programme."
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