Those militants who refuse to leave Eastern Aleppo will be regarded as terrorists, Russian Foreign Minister Sergey Livor said, adding that US Secretary of State John Kerry’s proposal handed over to him in Rome concerned "coordination of specific routes and dates for the pullout of all militants without any exceptions from eastern Aleppo."

"Those groups which refuse to leave eastern Aleppo will be treated as terrorists," Lavrov said. "By refusing to walk out from eastern Aleppo they will in fact go ahead with armed struggle. We will treat them accordingly, as terrorists and extremists, and support the Syrian army in its operation against such armed gangs."

"We proceed from the assumption the Americans, when they put forward their initiative for letting all militants leave eastern Aleppo, were well aware what steps they and their allies will have to take to influence the militants entrenched in that party of the city," he added.

According to Lavrov, experts of Russia and the US will first agree on the routes and a timeframe for the withdrawal of militants from eastern Aleppo and then a ceasefire will come into effect.

"During the Russian-US consultations, the sides will agree on the particular routes and a timeframe for the withdrawal of all militants from eastern Aleppo. As soon as they are coordinated, the ceasefire regime will enter into force," Lavrov said.