Russia, Iran and Turkey have agreed to try to broker peace talks between Syrian rebels and the Assad regime and to expand the fragile ceasefire in Aleppo to other parts of the country, Moscow said Tuesday.

The three regional powers most deeply involved in Syria’s war met for an unprecedented summit in Moscow and Russian foreign minister Sergei Lavrov said they had reached significant agreements.

"Iran, Russia and Turkey are ready to assist in preparing the agreement in the making between the Syrian government and the opposition and to become its guarantor," Mr Lavrov said.

"The ministers agree with the importance of widening the ceasefire, of free access for humanitarian aid and movement of civilians on Syrian territory.”