European leaders discuss Syria truce

European leaders, including Russian President Vladimir Putin, have held a conference call to discuss the Syrian truce, a source says.

Syrian children play outside their home at the rebel-held neighborhood of Tishreen, after a ceasefire that went into effect in Damascus, Syria Source: AAP

The leaders of Russia, France, Germany, Britain and Italy have held a conference call to discuss Syria, an Italian government source says.

Russian President Vladimir Putin, French President Francois Hollande, German Chancellor Angela Merkel, British Prime Minister David Cameron and Italian Prime Minister Matteo Renzi talked about "the situation in Syria" on Friday, the source said.

The European leaders told Putin that a fragile truce in Syria must be used to try to secure a lasting peace without President Bashar al-Assad, the spokeswoman for British Prime Minister David Cameron said.

"The main point that the European leaders made on the call to Putin was that we welcome the fact that this fragile truce appears to be holding," the spokeswoman told reporters.

"(And) we have got to use this as a positive dynamic now to create some momentum behind the talks ... so we can move from a truce into a more lasting durable peace with a political transition away from Assad."

Meanwhile war planes struck twice on Friday on the outskirts of Syria's Douma, northeast of Damascus, the first raids there since a cessation of hostilities agreement went into effect, a monitoring group said.

Rami Abdulrahman from the Britain-based the Syrian Observatory for Human Rights which monitors the conflict, said the identity of the jets was not immediately clear. He also said no casualties were reported.