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The United Nations on Sunday formally invited the Syrian regime to a new round of peace talks with the opposition at the end of August, deputy envoy to Syria Ramzy Ezzeldin Ramzy said.

Earlier in the week, the UN special envoy Staffan de Mistura told reporters in Geneva he wanted "to proceed with a third round of intra-Syrian talks towards the end of August" after two previous rounds of talks this year ended in failure.

De Mistura has struggled to keep the peace process alive amid a surge in fighting between Syrian President Bashar al-Assad's forces and rebel groups.

"I informed the minister and his deputy of the intention of the special envoy De Mistura to reconvene the inter-Syrian talks towards the end of August," Ramzy said after meeting the regime's foreign minister Walid Muallem and his deputy Faisal Muqdad.

"I explained to the minister how we intend to proceed, and we discussed how to render this process of political transition which has already been endorsed by the Security Council to be a credible one, and we exchanged views on that," Ramzy said.

He said Muallem "confirmed the intention of the Syrian government to participate in these talks once they are held".

Muqdad said Syria's government was "ready to resume the talks with no preconditions in an inter-Syrian context with no foreign interference," the official SANA news agency reported.

De Mistura's announcement comes with the armed opposition facing difficulties, especially in the northern city of Aleppo where government forces are besieging rebel-held districts and a rebel counter-offensive.

A peace roadmap, endorsed in December by the UN, called for the creation of a transitional body, which should have occurred on August 1, a new constitution and elections by mid-2017.

The UN-brokered talks have so far been deadlocked over Assad's fate.

The government has ruled out negotiations on his possible departure, while the main opposition High Negotiations Committee has said it will not agree to any deal that leaves Assad in power.

Since Syria was plunged into chaos in 2011 after protests were met with a brutal government crackdown, leaving more than 280,000 people dead and upwards of half the population displaced.

Agencies contributed to this report.