The arms are said to contain "chlorine-based toxins," the ministry detailed.
Al-Qaeda's offshoot in Syria appears to be amassing its forces in the region. More than 100 al-Nusra fighters have arrived to the Kafr Hamrah village, located in the northwestern suburbs of Aleppo, from Turkey, the ministry said, citing local civilians.
Various radical groups, who have been fighting in Syria to remove Bashar al-Assad, have been accused of using chemical weapons against civilians.
"Jaysh al-Islam group has used chlorine in Aleppo, and, it seems, is not even trying to hide it. It goes without saying that Russia condemns in the strongest possible terms the use of chemical weapons in combat operations by anyone, including non-state entities," Russian Foreign Ministry spokeswoman Maria Zakharova said.