Erdogan informed Putin of the strike that killed four Turkish soldiers, presidential sources said, which the Turkish army assessed to have been by the forces of President Bashar al-Assad early on Thursday.
It was the first time Turkey had blamed the Assad regime -- which is given military support by Russia -- for a deadly strike on its troops during Ankara's three month campaign inside Syria.
Erdogan and Putin also agreed to accelerate their efforts to find a solution to the humanitarian crisis in Aleppo, where the regime continues its Moscow-backed offensive to recapture the whole city, which is divided between the government and rebels.
During the phone call, Erdogan told Putin of how the Turkish-backed offensive in Syria was evidence of Ankara's determination to fight against terror, the sources added.
