Turkish Foreign Minister Mevlut Cavusoglu attends a news conference in Ankara, Turkey, August 14, 2018.
Senior officials from Russia, Iran and Turkey met with UN Syria envoy Staffan de Mistura in Geneva Tuesday.
The U.S. says it will retaliate harshly to any chemical weapons attack by President Bashar Assad's forces and has suggested such internationally prohibited weapons are being readied for the battlefield.
Erdogan will meet with Russian President in Sochi.
Mr Peskov said Mr Putin discussed the situation in Idlib with members of Russia's Security Council on Friday.
The report, based on 400 interviews, also examined aerial and ground attacks by Turkey's "Operation Olive Branch", conducted with allied Syrian rebels, which wrestled the northwest Afrin region from Syrian Kurdish forces this spring.
United Nations agencies and relief organisations have warned repeatedly that such an assault could spark one of the worst humanitarian disasters of Syria's seven-year war.
Kalin said the sides agreed that a Syrian government offensive on Idlib would "pave the way to humanitarian crises, to a wave of migration and (destroy) all existing political processes".
Also Friday, The Elders, an global non-governmental organization of public figures, called on Russia, Turkey and Iran to work "hand-in-hand to prevent heavy civilian casualties in Syria's Idlib region". Mr Erdogan and Mr Putin failed to agree on a ceasefire at a three-way summit in Tehran last week which also involved Iranian President Hassan Rouhani.
For weeks, government troops backed by Russian Federation and Iran have massed around Idlib, and air strikes and bombings have intensified in recent days. Turkey, however, backs opposition fighters seeking the ouster of the Syrian leader.
"Turkey is open to cooperation with everyone regarding efforts to fight terror groups in Syria", he added. "But killing everyone - civilians, women, children - like this in the name of fighting terrorist organizations is not right and is not humane", he said on a visit to Pakistan.
"We can not bring peace that way".
The Observatory recorded the deaths of 64 000 hardline Islamists and jihadists, including from the Islamic State group and former al-Qaeda affiliate factions.
Still, a meeting of presidential aides from Russia, Germany, Turkey and France devoted to Syria will take place in Istanbul on Friday.
Ankara failed last week to win agreement for a ceasefire from Russian Federation and Iran, President Bashar al-Assad's main backers, but there has been a recent lull in air strikes and a pro-Damascus source indicated a ground attack may not be imminent.
Syrian activists are reporting that new military reinforcements have arrived to beef up Turkish observation points inside Syria's last rebel bastion Idlib as a Syrian government offensive looms over the crowded enclave.
Turkish President Tayyip Erdogan met with the leaders of Iran and Russian Federation last week in Tehran, but failed to win a ceasefire pledge.