Big powers have also proved unable to stop the bloodshed in Syria, where UN officials say more than 5,000 people have been killed and Damascus says its security forces have lost 2,000.
Riad al-Asaad, Turkish-based commander of the rebel Free Syrian Army, called for international intervention to replace the Arab observer mission, which has just days to run.
"The Arab League and their monitors failed in their mission and though we respect and appreciate our Arab brothers for their efforts, we think they are incapable of improving conditions in Syria or resisting this regime," he told Reuters by telephone.
"For that reason we call on them to turn the issue over to the UN Security Council and we ask that the international community intervene because they are more capable of protecting Syrians at this stage than our Arab brothers," Asaad said.
President Assad, while proffering reform, has vowed to crush his "terrorist" foes with an "iron fist", but Syrians braving bullets and torture chambers appear equally determined to add him to the list of the past year's toppled Arab leaders.
Army deserters and other rebels have taken up arms against security forces dominated by Assad's minority Alawite sect, pushing Sunni Muslim-majority Syria closer to civil war.
"Terrorists" firing rockets killed an officer and five of his men at a rural checkpoint near Damascus, and wounded seven others, the state news agency SANA reported today, a day after gunmen assassinated a brigadier general near the capital.
Eight people were killed when a bomb hit a minibus on the Aleppo-Idlib road, the Syrian Observatory for Human Rights said.
In Homs, tank fire crashed into the Khalidiya district after a night rally against Assad there, activists said. YouTube footage showed a crowd dancing at the rally and waving the old Syrian flag used before the Baath Party seized power in 1963.
The British-based Observatory said two people were killed and nine wounded in the violence in Homs.
Activists also reported fighting between rebels and troops trying to edge into Khalidiya, a neighbourhood that is home to Sunni tribesmen and lies next to the Alawite district of Nozha.
Tanks were firing sporadically at the rebel-held town of Zabadani, near the Lebanese border, which has been under attack since Friday, activists said. They added that several soldiers who had tried to defect to the opposition had been killed.
Syrian forces shot dead a man at a roadblock in the restive Damascus suburb of Qatana, they said, and an activist was killed by sniper fire in the northwestern town of Khan Sheikhoun.
The Arab League must decide soon whether to withdraw its 165 monitors, whose mandate expires on Thursday, or keep them in Syria even though they are set to report that Damascus has not fully implemented a peace plan agreed on November 2.
The Arab plan required Syria to halt the bloodshed, withdraw troops from cities, free detainees, provide access for the monitors and the media and open talks with opposition forces.
Qatar has proposed sending in Arab troops, a bold idea for the often sluggish League and one likely to be resisted by Arab rulers close to Assad and those worried about unrest at home.
Syria's foreign ministry said today it was "astonished" at Qatar's suggestion, which it "absolutely rejected".
The League could ask the UN Security Council to act, but until now opposition from Russia and China has prevented the world body from even criticising Syria, an old ally of Moscow.
Western diplomats said a Russian draft resolution handed to the council on Monday did not make clear if Moscow would accept tough language demanded by the West.
Few Western powers favour any Libya-style military action in Syria, which lies in the heart of the conflict-prone Middle East. Bordering Lebanon, Turkey, Jordan, Iraq and Israel, it is allied to Iran and the armed Lebanese Shi'ite Hezbollah group.
The United States, the European Union, Turkey and the Arab League have announced sanctions against Syria, but while these have hurt its economy, they have yet to prompt Assad to change course. Opposition to sanctions from some of Syria's trading partners, notably Lebanon and Iraq, also dilutes their impact.
Council members have been divided for months over the uprising against Assad, with Western countries pushing for strong condemnation of the government's bloody crackdown but Russia seeking to shield its ally Damascus.
In October, Russia and China vetoed a European-drafted resolution that threatened possible sanctions. Russia presented its own draft on Dec. 15 and Western countries agreed to discuss and negotiate it, but there has been little progress since then.
Reuters
