Story highlights Syrian state media reports advances in Aleppo after breaking airport blockade

Iranian and Hezbollah militia are coordinating with regime forces in Syria

Syria troops have been massing near Aleppo since October

(CNN) The Syrian army has broken a two-year ISIS siege on the Kwairis military airport near Aleppo, which had been surrounded by the terror group since 2013.

Government forces killed "hundreds of ISIS terrorists and destroyed their dens and cells with all weapons inside," state news agency SANA reported. A major troop buildup has been in the works in the area since last month.

"The regime has been fighting since the end of September to break the siege," said Rami Abdurrahman, the head of London-based Syrian Observatory for Human Rights. "Taking this airport back from siege means they can advance to ISIS areas. They can use it to shell areas around Aleppo."

State media: Advances made

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