The offensive near the Turkish border, which began earlier this week, has sent tens of thousands of residents fleeing. Turkey has said about 10,000 Syrians have amassed on the Syrian side of the Turkish border and that about 70,000 more were on their way.
Meanwhile, there was mounting Western criticism of Russia's military support for its ally, Syrian President Bashar Assad.
Russian airstrikes in Syrian that mainly target opposition forces are "undermining efforts to find a political solution to the conflict," NATO Secretary-General Jens Stoltenberg said today.
The Syrian government offensive comes at a time when hopes for a peace deal are increasingly dim, amid signs of possible further foreign military intervention.
Earlier this week, a UN-led attempt to launch indirect talks between a government delegation and opposition representatives in Geneva was adjourned after several days of acrimonious bickering.
In today's fighting, pro-government troops retook the village of Rityan north of Aleppo, one of several communities they captured in the area this week, according to the state news agency SANA and the Britain-based Syrian Observatory for Human Rights.
The Observatory, an opposition monitoring group, said pro- government troops were backed by Russian airstrikes. It said that by taking Rityan, the government secured a road that links the predominantly Shiite villages of Nubl and Zahraa.
