On Sunday, the Syrian Army officially declared victory in the battle for Aleppo which began more than four years ago. The first clashes in the city broke out on July 19, 2012.

In the last few months, Aleppo has become an important battleground in Syria, engulfed by a conflict between government forces and a number of opposition and extremist groups. Over the past three weeks, the Syrian Army and militias have freed more than 98 percent of the territory of eastern Aleppo, according to the Russian reconciliation center.

Russia’s Envoy to the United Nations Vitaly Churkin said that an agreement had been reached on the withdrawal of militants from Aleppo.

According to Dolgov, such an agreement could mean that the command of the Syrian Army wants to minimize the number of casualties.

"This move can be regarded as being aimed not to prolong combat actions killing civilians and personnel. This is why the rest of the militants could have such an opportunity [to leave the city]," the expert told RIA Novosti.

"It was reported that American military advisers were in the ranks of the so-called moderate opposition forces in Aleppo. It was also reported that they have left the city or they could leave, but this is not confirmed.

But these factors may have been the reason behind this agreement," Dolgov pointed out. He underscored that the "liberation of Aleppo is a very important achievement by the Syrian Army on a scale of the entire Syrian crisis."

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