The UN-Arab League envoy on Syria on Tuesday urged the United States and Russia to build on their recent rapprochement to help bring about a political solution to the Syrian crisis.

The UN-Arab League envoy on Syria on Tuesday urged the United States and Russia to build on their recent rapprochement to help bring about a political solution to the Syrian crisis.

Brahimi also called on the two powers to build on the momentum from their deal to dismantle Syria's chemical weapons.

"What matters now is that this rapprochement between Russia and the United States is confirmed, lasts, and that together these two leading countries mobilize other leading countries so that we finally move towards a political solution," he said in an interview with Swiss public broadcaster RTS.

Brahimi said he would like to see peace talks begin "the day after tomorrow".

"But to be realistic, they're not going to be before October, and probably not in early October," he said.

"The problem isn't getting a conference started, the problem is to be sure that there's real, solid political will from the players who count."

A peace conference was first proposed by the United States and Russia in May but momentum toward holding the event was lost as Washington and Moscow bickered over the conflict.

Brahimi said he would discuss plans with US Secretary of State John Kerry and Russian Foreign Minister Sergei Lavrov on September 28 during a UN General Assembly session in New York.