Interested in Syria? Add Syria as an interest to stay up to date on the latest Syria news, video, and analysis from ABC News.
Turkey is seeking to avert a widely anticipated Syrian regime offensive on Idlib, the last rebel stronghold where more than 3 million civilians are at risk.
Ramadan also said the deal offers the Syrian government and Russian Federation one of their main demands, which is securing the highway that passes through Idlib and links northern Syria with other cities.
Ahead of the trip to Russia, Erdogan had said Turkey's calls for a ceasefire in Idlib region were bearing fruit after days of relative calm but that more work needed to be done.
The plan is major landmark for Syria, where the standoff in the last militant stronghold of Idlib has threatened to turn into a major global crisis in recent weeks.
On Sept. 7, the presidents of Turkey, Iran and Russian Federation held a trilateral meeting and discussed the situation in Idlib. That was one of the government's strategic aims in an offensive in Idlib.
The U.S. has warned Assad and Russian Federation against launching an assault and threatened to retaliate if regime forces use chemical weapons.
Assi said the sides could also agree to modify the borders of the deescalation zones to keep armed rebels from certain sectors. "Russia swallowed all its accusations", he said. The zone would be patrolled by Turkish and Russian forces. Parts of it are held by Turkey-backed rebels but numerous towns are controlled by jihadist fighters such as Tahrir al-Sham, which includes insurgents from the former al Qaeda branch in Syria.
The Idlib region is home to around 3 million people.
He said he was confident that the deal "would not have been possible without the steadfastness of our people and fighters".
The announcement, at a joint press conference between Russian President Vladimir Putin and his Turkish counterpart, Recep Tayyip Erdogan, comes after weeks of speculation that an all-out government assault on the last opposition enclave would prompt a humanitarian catastrophe.
Russian Federation and Iran, who back the Syrian government, want to eliminate what they call "terrorist groups" in the province, which neighbours Turkey.
Nearly 3 million civilians live in Idlib and fighting could provoke a massive new exodus of refugees to Turkey.
NFL Defender Sensationally Retires Mid-Way Through Game
Gaines played nickel cornerback for the Bills on Sunday after an injury to rookie Taron Johnson in the season opener. Bills linebacker Lorenzo Alexander told reporters that the move was " completely disrespectful to his teammates".
Lucas Perez denies refusing to warm-up for West Ham vs Everton
After making three appearances so far for the club, Perez is yet to score his first Hammers goal. I was anxious about the game, because I was absolutely convinced we must end these bad results.
Steelers rally to tie Chiefs 21-21 at half
The Chiefs will look to continue their winning ways next week at Arrowhead Stadium against the San Francisco 49ers at 12:00 p.m. Pittsburgh used its new life to score its first touchdown on a 26-yard pass from Roethlisberger to James.