Istanbul (AFP) - The Turkish army on Wednesday released a series of audio recordings of apparent warnings issued to a Russian jet before it was downed near the Syrian border.

"This is Turkish Air Force speaking on guard. You are approaching Turkish airspace. Change your heading south immediately," a voice in one of the recordings can be heard saying in English, repeating the message several times.

The surviving pilot of the Su-24 bomber shot down on Tuesday said earlier that no warning had been given and the aircraft did not violate the Turkish air space, although Turkey insists that it gave 10 warnings in five minutes.

Turkey says its F-16 jets shot down the Russian plane under its rules of engagement, while Moscow says the act was a "planned provocation."

The downing has threatened ties between two major rival players in the Syrian war and raised fears it could escalate into a wider geopolitical conflict.