Airstrikes in northern Syria after US-Russia agreement

Kerry, speaking to reporters after on-and-off talks with his Russian counterpart that began Friday morning and stretched past midnight, said the deal reached by the US and Russia aims to reduce violence and eventually move toward a political transition.

The cease-fire begins at sundown Monday, Kerry said, coinciding with the Muslim Eid al-Adha holiday.

The United States and Russian Federation hailed a breakthrough deal on Saturday to put Syria's peace process back on track, including a nationwide truce effective from sundown on Monday, improved humanitarian aid access and joint military targeting of banned Islamist groups.

The breakthrough agreement, following talks in Geneva, will see a nationwide ceasefire starting on Monday, followed a week later by an unexpected new military partnership between the USA and Russian Federation to target Islamic State and al Qaida militants.

Russian Foreign Minister Sergei Lavrov said that despite continuing mistrust, the two sides had developed five documents that would revive a failed truce agreed in February and enable military coordination between the US and Russia against militant groups in Syria.

"The cessation of hostilities requires access to all besieged and hard-to-reach areas, including Aleppo", Kerry said.

Kodmani said the rebels would break ranks with the jihadists if the truce deal held.

"But let us also hope this agreement shows what is possible if people negotiate in good will towards a political settlement that will isolate Jihadist extremists, and bring a lasting peace not just to the city of Aleppo but to all the people of Syria".

He called the deal a potential "turning point" in the conflict, if implemented by Syria's Russian-backed government and US-supported rebel groups.

The strategy would need the regime and resistance "to satisfy their duties", Mr Kerry said in Geneva.

He said Syrian President Bashar Assad's government was informed of the accord, and was prepared to comply.

"I want to emphasize, this step is absolutely essential, it is a bedrock of this agreement", Kerry said.

A nationwide ceasefire between government forces and rebel groups is set to begin at sunset on Monday.

The violence shows that it might be hard to implement the U.S. -Russia agreement as both countries enjoy limited influence on the government and insurgent groups to cease the bombardment.

They must now pull back from demilitarised zones, and allow civilian traffic and humanitarian deliveries - notably into the divided city of Aleppo where as many as 500,000 people have been killed in fighting.

Seven days after the start of the cessation of hostilities, Russian Federation and the USA will establish a "joint implementation centre" to fight IS and another main group, Jabhat Fateh al-Sham. Then, the USA and Russian Federation would begin intelligence-sharing and targeting coordination, while Assad's air and ground forces no longer would be permitted to target Jabhat Fatah al-Sham; they would be restricted to operations against the Islamic State group. It adds that the U.S. -Russia agreement "was reached with the knowledge and approval of the Syrian government".

Kerry said it would be "wise" for opposition forces to separate completely from Jabhat Fatah al-Sham, a statement Lavrov hailed.

Hundreds of thousands of people have been killed in the more than five-year-old Syrian conflict, which has led to to the worst refugee crisis throughout the region and Europe since World War II. Insurgents said they were planning a counter offensive.

Rebel-held parts of Aleppo are under full siege and two major suburbs of Damascus have been taken out of rebel control after an agreement was reached with the government.

"The armed opposition in Syria now faces what is perhaps its biggest and most momentous decision since they chose to take up arms against the Assad regime in 2011", said Charles Lister, a senior fellow at the Middle East Institute think-tank.

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