"Indeed, militants possess weapons such as ZU-23 [anti-aircraft gun] and others that are capable of hitting targets at the height of 4,000 meters, especially, such a big aircraft as Syrian Air Force's IL-76 military transport plane," Russian Defense Ministry spokesman Igor Konashenkov told RIA Novosti.
"It [the cargo delivery operation] is very risky. In most cases delivery is performed at night without any illumination."
"They [Syrian authorities] confirmed that the humanitarian aid is ditributed to people in need," Maj. Gen. Igor Konashenkov said.
Last week, Russia launched a humanitarian operation in Syria aimed at delivering supplies to civilians trapped in the regions of Syria controlled by the militants.
On January 15, a cargo plane of the Syrian Air Force using Rusian P-7 platforms airdropped a total of 50 tons worth of food supplies and basic necessities to the city of Deir ez-Zor.