Syria peace talks are expected to begin within a few days, Russian Foreign Minister Sergei Lavrov says, adding that Moscow is ready to cooperate more closely with the United States on aid supplies.

Key points: US, Russia say Syrian peace talks will start on January 25

US, Russia say Syrian peace talks will start on January 25 A representative for the opposition has not yet been confirmed

A representative for the opposition has not yet been confirmed Russia ready to "more closely" coordinate with US coalition

Mr Lavrov, who met his US counterpart John Kerry in Zurich on Wednesday in a bid to give momentum to Syria peace talks due to begin on January 25, rejected suggestions the negotiations might be delayed until February amid disagreements over who will represent the opposition.

"We are sure that in the next few days, in January, these talks should begin," he told reporters.

He stressed though that the United Nations was leading the process and the start date would ultimately be determined by UN chief Ban Ki-moon and his envoy on Syria, Staffan De Mistura.

Mr Kerry did not make any comments on Wednesday, but his spokesman John Kirby said in a statement that the two men had "discussed plans for the UN-led negotiations between the Syrian parties on January 25 and the importance of maintaining progress toward a diplomatic solution to the crisis in Syria".

Before leaving Washington on Tuesday, Mr Kirby had meanwhile acknowledged that "there is still quite a bit of work that needs to be done to get the meeting to occur" between Syrian President Bashar al-Assad's regime and representatives of the opposition.

But disagreement over who will represent the opposition has cast doubt over whether the UN-brokered talks will begin on schedule.

The 17 countries pushing for a peace deal for war-ravaged Syria, including the United States, Russia, Saudi Arabia and Iran, have struggled to agree on the list of opposition delegates.

Closer coordination for airstrikes, aid

Mr Lavrov meanwhile said that he and Mr Kerry had discussed another thorny issue: Russia's air strikes in Syria.

He said Moscow was ready to coordinate more closely with the US-led coalition to help facilitate aid deliveries inside the war-torn country.

"We spoke about how the Russian air force, when planning its actions, takes into account the programs that the UN humanitarian organisations, the Red Cross and other NGOs carry out," Mr Lavrov said.

"We said that we will be ready to more closely coordinate our actions with the American coalition in this direction."

Earlier on Wednesday, the Britain-based Syrian Observatory for Human Rights said the Russian air strikes had killed more than 1,000 civilians, including more than 200 children, in Syria since they began in September.

Russia is a staunch ally of the Syrian government and has coordinated its strikes with Damascus, saying it is targeting Islamic State (IS) militants and other "terrorist" groups.

But activists and rebels accuse Moscow of focusing more on moderate and Islamist opposition fighters than the IS group.

A coalition led by Washington has also been carrying out strikes against IS fighters in Syria since September 2014, but it does not coordinate its raids with Damascus.

Those strikes have killed 4,256 people since they began, among them 322 civilians, including over 90 children, according to the Observatory.

AFP/Reuters