"The opposition will continue to remain in the areas where they are". "But together with Russian Federation, we will put our efforts into clearing those territories of radical elements", he said, referring to Al Qaeda-linked extremists in Idlib. "Russian Federation will take measures to assure that the de-confliction zone will not be attacked", he said.
But on Monday, Russian Defense Minister Sergei Shoigu said that the anticipated military offensive in Idlib was not on the agenda anymore.
On Thursday, the Observatory said that 185 truckloads of weapons and military gears entered areas in Idlib from Turkey under the supervision of the Turkish forces, which maintain 12 observation points in Idlib and nearby Hama countryside.
Russian Federation had been preparing for an imminent attack on Idlib.
The reluctance of the Obama and Trump administrations to get more involved, analysts say, may have played a role in the Putin-Erdogan talks.
This approach, Putin said, is supported by Syrian President Bashar al-Assad. You have the Russians and Iranians in there supporting the regime.
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Senior Advisor to UN Special Envoy for Syria Jan Egeland on Monday urged the Syrian government and armed opposition to respect the deal and not provoke bloodshed and allow humanitarian access. This would entail a "withdrawal of all radical fighters" from Idlib including the Al-Nusra Front, he added.
Mr. Putin said all "hard-line militants" - Islamic State fighters, al Qaeda extremists and members of other terrorist groups - would be removed from the area.
Russian Federation and Iran, the two allies of Syrian President Bashar al-Assad, clashed with Turkey at a summit on September 7 in Tehran, rejecting Erdogan's call for an immediate cease-fire in Idlib.
Numerous 3 million in Idlib have already been displaced from other parts of Syria following the collapse of the opposition resistance in cities such as Aleppo. The talks appeared to end in deadlock over efforts to avert conflict in Idlib.
"In order to give people in Idlib peace of mind then, this agreement needs to be built upon by the global powers working together to find a lasting political solution that protects civilians", Bramwell said.
Mr Putin made the announcement after meeting with Turkish President Recep Tayyip Erdogan.
"The situation in Idlib has been quiet for two or three days".
The demilitarized zone will come into force by October 15, Putin told reporters.
Aid organizations said they feared an assault by Syrian and Russian forces could cause widespread carnage and displace tens of thousands of people.