"They cover the air space of the Syrian north", the commander told Reuters, describing the deployment as a "message to everyone".
Several schools in Damascus announced they were suspending classes for the next few days due to the upsurge in violence.
According to sources, the casualties are expected to rise as the regime attacks are continuing.
The Syrian Observatory said it was the highest number of deaths recorded in one day since attacks escalated six weeks ago.
The military says the soldier was killed late Monday by a mortar-and-rocket attack.
French President Emmanuel Macron said last May that "any use of chemical weapons would result in reprisals and an immediate riposte, at least where France is concerned".
The UN Security Council (UNSC) has rejected the USA statement condemning the use of Chlorine gas in Syria in which more than 20 civilians were injured including children.
Russian Ambassador Vassily Nebenzia retorted, "It's completely clear to us the goal is to basically accuse the Syrian government of chemical weapons use where no perpetrators have been identified".
Photo in the aftermath of a chlorine gas attack in rebel-held Ghouta area.
The government has dismissed the reports as "lies", but the head of the UN's International Commission of Inquiry on Syria called them "alarming".
The court, however, ordered that the doctors should be placed under judicial controls, the Hurriyet daily reported.
The Secretary noted last month in Paris that Russian Federation ultimately bears responsibility for the victims in East Ghouta and countless other Syrians targeted with chemical weapons since Russian Federation became involved in Syria.
The measure would "enable the delivery of humanitarian aid and services, evacuation of the critically sick and wounded, and alleviation of people's suffering, to the extent possible, wherever they are", the United Nations said.