Russia says the Syria-bound plane intercepted by Turkey amid reports it was carrying cargo which could aid government war efforts was transporting a legal shipment of radar equipment. "There were no weapons on the plane," said Foreign Minister Sergei Lavrov.
His comments followed heated exchanges between Turkey and Syria over the exact nature of the items confiscated.
Turkey's PM earlier said Russian-made defence equipment was found on board - a claim Syria dismissed as a lie.
Damascus has challenged the Turks to put the seized goods on public view.