The source added that Damascus has indicated several times that the so-called "moderate opposition" in Aleppo had been receiving weaponry supplies from the Turkish territory with the help of funds of Persian Gulf monarchies.
"Moreover, some of the weapons were stolen from Syrian Army warehouses," the source said.
On December 16, the Russian Defense Ministry's center for Syrian reconciliation said that the Syrian army operation to liberate eastern neighborhoods of Aleppo was over, and that Syrian government troops were eliminating separate hotbeds of militant resistance.
The Syrian forces announced that Aleppo had been fully liberated from militants on December 22.
On December 23, Maj. Gen. Zaid Saleh, the head of Aleppo's security committee, told Sputnik that over 31,000 militants and members of their families had left eastern districts of Aleppo under the agreement with the Syrian government.
Since 2011, Syria has been engulfed in a civil war, with government forces fighting against numerous opposition and terrorist groups, including the Islamic State (IS, also known as Daesh), which is banned in a range of countries, including Russia.