U.S. Secretary of State John Kerry warned Russia and the Syrian government on Wednesday to respect a "frayed" ceasefire, as vicious fighting south of second city Aleppo left dozens dead.
The vital northern province of Aleppo has been ravaged on multiple fighting fronts in a devastating war that has killed more than 280,000 people.
The conflict has also drawn in world powers who back opposing sides -- including the United States which broadly supports the opposition and Russia on the side of President Bashar Assad.
"Russia needs to understand that our patience is not infinite, in fact it is very limited with whether or not Assad is going to be held accountable," said Kerry.
"We also are prepared to hold accountable members of the opposition," he said after a meeting in Norway with his Iranian counterpart Mohammad Javad Zarif.
U.N.-hosted peace talks aimed at ending the five-year conflict have been stalled since April, and a fragile ceasefire deal between the government and non-jihadist rebels has all but collapsed.
Washington and Moscow have tried to reinforce the broader truce with temporary, local freezes on fighting, but to no avail.
"It is very clear that the cessation of hostilities is frayed and at risk and that it is critical for a genuine cessation to be put in place. We know that, we have no illusion," said Kerry.
Efforts were underway, he said, to reach a new agreement "in the next week or two" to reinstate the ceasefire across Syria, leading to more humanitarian aid deliveries and a resumption of the peace process.
- Fresh Aleppo clashes -
In Aleppo province, dozens of fighters were killed in a fresh bout of fighting between the regime, rebels, and jihadists south of Aleppo city, said the Syrian Observatory for Human Rights.
Backed by Russian and government air strikes, pro-regime fighters are locked in battle with rebel groups and al-Qaida affiliate al-Nusra Front for a string of villages lying in hilly terrain between strategic routes.
"To the west there is an opposition supply route that reaches Idlib province, and to the northeast there is the last regime supply route out of Aleppo city," said the Observatory's Rami Abdel Rahman.
Since fighting erupted on Tuesday, at least 70 fighters in total have been killed and the villages of Zaytan and Khalasa have changed hands twice.
The strategic border province is criss-crossed with supply routes for various sides of the conflict, including rebels, regime, Kurds, and jihadists like the Islamic State group.
Aleppo was once Syria's commercial powerhouse, but it has been a battleground since 2012 when rebels seized the east of the city confining the army to the west.
As opposing forces close in from either side, residents of both halves of the city fear a potential total siege on the northern metropolis.
The U.N. says nearly 600,000 Syrians live in besieged areas, most surrounded by government forces.
Earlier this month, it said the government had granted preliminary aid access to 15 of 18 besieged areas, after one was taken off the U.N.'s list.
- Activists accuse U.N. -
Dozens of opposition activist groups accused the UN of "capitulating" to Damascus on aid access.
The scathing report, authored by The Syria Campaign (TSC) advocacy group, was based on testimonies from current and former U.N. staff and other aid workers.
It accused the U.N. of "choosing to prioritize cooperation with the Syrian government at all costs," allowing the regime to unduly influence U.N. aid strategy.
The U.N. humanitarian coordinator for Syria, Yaacoub El Hillo, said however that while aid access was not ideal, the U.N. continues to "assist Syrians based on need."
TSC spokeswoman Bissan Fakih countered: "A U.N. with the backbone to stand for its principles would help get aid to hundreds of thousands of Syrian civilians under siege, many of them only a few minutes' drive from where the U.N. is based in Damascus."
Syria's government condemned "the presence of French and German special forces" in the country's north, including the flashpoint towns of Kobane on the border and IS-held Manbij.
Paris recently admitted its special forces were deployed alongside an Arab-Kurd alliance backing the offensive to expel IS from Manbij.
But German defense ministry spokesman Boris Nannt denied his country's troops were in Syria, telling journalists "there is absolutely nothing (to) it."
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