The peace talks would come as the Turkish forces have started to construct the fourth observation point in Syria's Idlib, the Turkish General Staff said in a statement.
Paulo Pinheiro, head of the U.N. Commission of Inquiry on Syria, said the commission had "alarmingly" received several reports that chlorine had been used in attacks on the towns of Saraqeb, in the northwestern Idlib Province, and Douma in Eastern Ghouta near Damascus.
Turkey, with the support of the Free Syrian Army (FSA), launched Operation Olive Branch on January 20 with the stated aim of clearing YPG and Daesh terrorists from Syria's northwestern city of Afrin.
But the "de-escalation" in violence they were supposed to monitor has collapsed.
Russia, a close ally of President Assad, has shielded the Syrian regime from worldwide condemnation over the alleged use of chemical weapons.
Turkey considers towns like Manbij to be originally Arab-majority territory whose ethnic balance was upset in favour of the Kurds during a seven-year civil war.
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That followed an unprecedented summer transfer window, which saw Premier League teams splash out a staggering £1.4bn. Almost two-thirds of the gross expenditure was by the top six, while the bottom six accounted for about a fifth.
Turkey began deploying forces in an observer role to the rebel-held Idlib in October as part of a "de-escalation" agreement with Iran and Russian Federation to stabilize the lines of conflict in the war-torn country.
At least 47 people have been killed in Eastern Ghouta near the Syrian capital following heavy aerial bombardment by Syrian and Russian forces, the Syrian Observatory for Human Rights reported.
Ahead of the Turkish offensive against Afrin, the Syrian government had threatened to shoot down any Turkish warplanes in Syrian air space.
The Syrian Civil Defense, also known as the White Helmets, says Tuesday's airstrikes targeted the village of Termala in Idlib, the largest rebel stronghold in Syria.
Separately, Turkey launched an offensive two weeks ago into another neighboring part of Syria, the Afrin region, against Kurdish fighters who control it. First, he used his handgun against attackers and then blew up himself with a hand grenade.
She again rejected Moscow's proposed resolution to replace the JIM, saying it ignores the JIM's findings - "an investigation that Russian Federation supported until the investigators found the Assad regime to be responsible".