But Russia's President Vladimir Putin said Moscow opposed a truce, and Iranian leader Hassan Rouhani said Syria must regain control over all its territory.
And Russia wants to maintain its regional presence to fill the vacuum left by America's long uncertainty about what it wants in the conflict.
"Turkey will have to decide in this summit whether to join the battle and influence it, or stay put and let the Russians and Iranians lead it".
He called on all militants in Syria to disarm and seek a peaceful end to the conflict.
Turkish President Tayyip Erdogan called for a ceasefire in the rebel-held region of Idlib in northwest Syria on Friday and said an anticipated government assault on insurgents there could result in a massacre. The three leaders whose nations are all under US sanctions have an interest in working together, but Idlib is complicated and they have little common ground.
Northwestern Idlib province and surrounding areas are home to about 3 million people - almost half of them civilians displaced from other parts of Syria.
According to the pro-government Turkish daily newspaper, Sabah, Turkey will propose Friday a plan that includes disarming militants and evacuating them through safe corridors to a buffer zone.
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But the imports were still among the lowest this year due to a drop-off in demand from the country's smaller independent refineries.
Elsewhere in his address, Rouhani said joint efforts made by regional and world countries as well as the United Nations have contributed to almost ending war and bloodshed in Syria, stopping acts of terror in the country and preventing their long-term regional and worldwide consequences.
But regime backers Russian Federation and Iran have sworn to wipe out "terrorists" and Syrian President Bashar al-Assad has declared his determination to retake control of the entire country.
For Turkey, the stakes couldn't be higher.
Turkey also does not want to see another Kurdish-controlled area rise along its border, as it already faces in northern Iraq. Russia, which has provided air support to the Syrian Army since 2015, has made a big show of force by moving 10 warships and two submarines off the coast of Syria. But all too often, establishment takedowns of Trump-from centrist conservatives and liberals who consider themselves "the grownups" in this improbable era-dwell on course-correcting one of the few things the Trump administration has done moderately right: not getting us further entangled in foreign civil wars, nation-building boondoggles, and other imperial adventures of the sort that Bush-Clinton-Bush-Obama adored.
The top Iranian diplomat for Syria policy told Iranian media that Idlib posed a dilemma because it had to be liberated from "terrorists" but the security of millions of civilians had to be protected.
"Turkey has limited options but to concede to Russian Federation on Idlib given the diplomatic row with Washington and the recent USA decision to solidify Kurdish control of northern Syria", said Joe Macaron, a fellow at the Washington-based Arab Center.
The Syrian military has been urging the rebels in Idlib to surrender.