Istanbul - The Turkish military on Wednesday released what it said was an audio recording of a warning to a Russian fighter jet before it was shot down near the Syrian border.

A voice on the recording can be heard saying “change your heading”.

The surviving crew member of the Russian fighter jet shot down by Turkey on Tuesday said earlier the plane received no warnings from the Turkish Air Force and did not fly over Turkish air space, Russian news agencies reported.

Turkey said the downed jet had encroached on Turkish air space and was warned repeatedly to change course, but Russian officials have said the plane was at no time over Turkey.

The crew ejected, and one pilot was shot dead by rebels as he parachuted to the ground. A Russian marine sent to recover the crew was also killed in an attack by rebels.

The surviving pilot was quoted by Russian agencies as saying the crew “knew the region like the back of their hand”, that they did not fly over Turkish air space, and that there were no visual or radio warnings from Turkey.

At a business event in Istanbul, Erdogan said Turkey had made a “huge effort” to prevent such incidents but that the limits of its patience had been tested after repeatedly warning Russia about air space incursions in recent weeks.

“Nobody should expect us to remain silent against the constant violation of our border security, the ignoring of our sovereign rights,” Erdogan said.

Turkey has been angered by Russian air strikes in Syria, particularly those near its border targeting Turkmens, who are Syrians of Turkish descent. Erdogan dismissed Moscow’s assertions that it is in Syria to combat Islamic State.

“The Daesh terrorist organization does not have a presence in this region of Latakia and the north where Turkmens are based. Let’s not fool ourselves,” he said, using an Arabic acronym for Islamic State.

He also took a swipe at Russian support for Syrian President Bashar al-Assad, whose removal from power Turkey sees as critical to any hopes for lasting piece.

“To side with someone who spreads state terrorism, to give consent to brutality is brutality itself,” he said.

Russia questioned Turkey’s relationship with Islamic State.

Prime Minister Dmitry Medvedev alleged Turkish officials were benefiting from Islamic State oil sales. Lavrov said it was no secret that “terrorists” use Turkish territory.

Senior Turkish officials vehemently denied in any way supporting the radical Islamist group. The government says it is doing its best to combat cross-border fuel smuggling and has been able to curb the trade.

“Our position on Islamic State is perfectly clear,” a senior official said, pointing out Turkey was a key member of the U.S.-led coalition against Islamic State and had suffered attacks by the militants itself.