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The leaders of Russian Federation and Turkey on Monday announced that a deep demilitarized zone will be established in Syria's Idlib region, the last bastion of anti-government rebels where fears had been high of a devastating offensive by government forces.
Russian President Vladimir Putin and his Turkish counterpart Recep Tayyip Erdoğan met for over four hours in Russia's Black Sea resort of Sochi to decide the fate of Idlib, home to three million people.
It was not immediately clear how the deal would be implemented.
"Bombarding Idlib can lead to a humanitarian crisis, therefore it is unacceptable", Cavusoglu said.
Among the Russian delegation are Foreign Minister Sergey Lavrov, Energy Minister Aleksandr Novak, Defense Minister Sergey Shoygu and Kremlin Spokesman Dmitry Peskov. "But together with Russian Federation we will make efforts to clear these territories of radical elements", Erdogan said.
Russian Defence Minister Sergei Shoigu said that the agreement between Putin and Erdoğan meant that no military action would be taken against Idlib, Russian news agencies reported.
Putin, for his part, said Turkey-Russia relations "are developing positively".
Following the meeting, Ankara and Moscow signed a memorandum of understanding calling for the stabilization of the situation in Idlib's de-escalation zone, in which acts of aggression are prohibited.
"Turkey offered Putin a ladder with which to climb down from the tree, threatening a military offensive in Idlib that had little chance for success", Ramadan said in a series of text messages with The Associated Press. "Turkey is in a strong position".
But Putin said a zone of approximately 9-12 miles would be carved out for the Syrian opposition before October 15.
The United Nations expects up to 900,000 people to flee if Syrian government forces launch a large-scale offensive on Idlib, home to some 3 million people.
Russia-backed forces of the Syrian regime have massed around Idlib province in recent weeks, sparking fears of an imminent air and ground attack to retake the last major opposition bastion.
Russian Federation has called Idlib a hotbed of terrorism and had said the Syrian government has the right to retake control of it. Turkey appealed to Russian Federation and Iran, its uneasy negotiating partners, for a diplomatic resolution. At the same time, it has sent reinforcements to its troops ringing Idlib, a move created to ward off a ground assault, at least for now.
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.
There are an estimated 60,000 rebel fighters in Idlib and its surrounding areas.