UN ends Syria mission, Aleppo hit again

Russia and China have vetoed three Western-backed Security Council resolutions that would have stepped up pressure especially against the Syrian government by threatening sanctions if the fighting didn't stop. (AAP)

Russia and China have vetoed three Western-backed Security Council resolutions that would have stepped up pressure especially against the Syrian government by threatening sanctions if the fighting didn't stop. (AAP)

The UN has pulled the plug on its observer mission in Syria as the regime launches a fresh attack on the rebels bunkered in the city of Aleppo.

The United Nations has called an end to its observer mission in Syria, as activists reported more bloodletting in an attack on civilians in the main battleground of Aleppo.

The UN decision was announced on Thursday as the international community piled the pressure on President Bashar al-Assad's embattled regime to end 17 months of fighting that is now threatening to entangle neighbouring Lebanon.

"The conditions to continue UNSMIS were not fulfilled," France's UN ambassador Gerard Araud said after a New York meeting on the conflict, referring to the mission whose mandate is due to end at midnight on Sunday.

Major powers have long been at odds on how to end the increasingly brutal battle for Syria, and the withdrawal of the observers follows the collapse of a peace plan drawn up by outgoing peace envoy Kofi Annan.

On the ground, activists reported that Syrian forces shelled a group of people queuing outside a bakery in the Qadi Askar district of eastern Aleppo, the city at the centre of the battle between the regime and armed rebels.

The Syrian Observatory for Human Rights said 10 people were killed in the district, and that at least 99 had died in violence across the country on Thursday, most of them civilians.

On Wednesday, around 40 people, including women and children, were killed in a massive air strike on civilians in the rebel bastion of Aazaz, just north of Aleppo, according to rights groups and residents.

Human Rights Watch urged the UN Security Council to impose an arms embargo on Syria after the air strike on Aazaz. "Yet again, Syrian government forces attacked with callous disregard for civilian life," it said.

Mohammed Nur, director of the now closed Aazaz media centre, said 40 people were killed - including 30 from one extended family - and 150 wounded.

"Bashar al-Assad doesn't care where the bombs land and in any case, his pilots are not that accurate," he said.

With the violence showing no signs of abating, Russia, which has with China blocked three UN resolutions on the crisis, called for world powers to make a joint appeal for the regime and rebels to end the fighting.

Russia has called a meeting in New York on Friday of UN ambassadors from the so-called Geneva action group on Syria.

It was not immediately clear whether the Western powers - still angry at Russia and China for their vetoes of the UN resolutions - would attend the New York meeting.

The United States said on Thursday it held "serious" talks with Russia about Syria after months of disagreement over the bloodshed and renewed its call for a political transition.

Chinese Foreign Minister Yang Jiechi also urged a visiting Syrian envoy to implement a ceasefire and accept international mediation.

But French Foreign Minister Laurent Fabius renewed calls for Assad to go.

"France's position is clear: we consider Assad to be butchering his own people. He must leave, and the sooner he goes the better," Fabius said at a refugee camp for Syrians in Jordan, before he flew on to Lebanon.

Fabius told AFP he had information that Assad's regime would be rocked by more "spectacular" defections soon.

The Damascus regime has already been hit by the defections of Assad's prime minister Riad Hijab and general Manaf Tlass, his childhood friend and the son of a close aide of Assad's father Hafez, who ruled Syria with an iron fist.

Fabius said the regime was in a state of "decomposition", adding: "We would like this to happen as fast as possible."

Earlier on Thursday, the Organisation for Islamic Cooperation suspended Syria, with its chief Ekmeleddin Ihsanoglu saying: "This (Muslim) world can no longer accept a regime that massacres its people using planes, tanks and heavy artillery."

The United States and the opposition Syrian National Council welcomed the move, but it was rejected by Syria's staunch ally Iran and by Damascus, which charged it was the victim of a US-masterminded "conspiracy".

Assad, whose regime has also been hit by a bomb attack that killed his top security chiefs, insists he is fighting a "terrorist" plot aided by rival Sunni Muslim powers including Saudi Arabia.

UN humanitarian chief Valerie Amos, who visited Damascus to push for greater aid access, warned that the situation was worsening, with the number of people in need possibly as high as 2.5 million and one million at risk of "destitution".