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"The drones were launched from the area of Muazzara in the southwestern part of the Idlib de-escalation area controlled by so-called 'moderate opposition' units," defence ministry newspaper Krasnaya Zvezda said.
Idlib is one of four de-escalation zones in Syria covered by a deal meant to reduce violence that was struck last year by Turkey, Russia and government-backer Iran.
On Tuesday, Turkey's foreign ministry summoned the Russian and Iranian ambassadors to Ankara, according to diplomatic sources, after saying the Syrian regime was targeting moderate opposition forces in Idlib near the Turkish border.
On Monday, Russia said pilotless drones carrying explosives attacked Russian bases in Syria last weekend without causing any casualties or damage.
After two years of Russian military support for the regime of Syrian leader Bashar al-Assad, President Vladimir Putin announced in mid-December the partial withdrawal of forces from the country, saying their task had been largely completed.
The size of the toal Russian deployment in Syria is not known but independent Russian military expert Pavel Felgenhauer told AFP that up to 10,000 troops and private contractors could have taken part in the conflict.
More than 330,000 people are estimated to have been killed in the Syrian war, which began in 2011 as the regime crushed anti-government protests. Millions have been displaced.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)