Syrian news agency SANA said the 56-year-old pilot -- who managed to bail out of his aircraft before it went down in Turkey in March -- was released by Turkish authorities yesterday.
Turkey's Dogan news agency said a court ordered his release pending a trial for "espionage" and "violating the frontier" and that he had been transferred yesterday to a centre for migrants.
SANA identified the pilot as Mohammed Sufan and said "he has been handed over to the competent (Syrian) authorities".
Today, Turkey said it had deployed dozens of soldiers in the Syrian northwestern province of Idlib to establish "observation posts".
Idlib is one of four so-called "de-escalation" zones under a deal brokered by Russia, Turkey and Iran in May, as part of a major push to still fighting in war-torn Syria.