"After an intense artillery preparation fire, Nusra Front and Ahrar ash-Sham armed groups attacked the positions of Kurdish militia and volunteers from local residents in the neighborhood of Sheikh Maqsood in northern Aleppo," the spokesman said.
According to him, Kurds managed to destroy several armored vehicles of the adversary as fierce fighting in the neighborhood continued.
The spokesman added that over 2,000 militants from various terrorist groups and units of so-called moderate opposition were stationed in Sheikh Maqsood vicinity.
He stressed that the Russian Aerospace Forces and the Syrian Air Force were not carrying out strikes against the positions of moderate opposition.
Syria has been mired in civil war since 2011, with government forces loyal to Syrian President Bashar Assad fighting numerous opposition factions and extremist groups.
The ceasefire in Syria worked out by Russia and the United States took effect on February 27. The cessation of hostilities does not apply to terrorist organizations, such as the Islamic State and the Nusra Front, outlawed in a number of countries worldwide including Russia and the United States.