Russia has announced a series of economic sanctions against Turkey after the downing of a Russian jet near the Syrian border.
Turkey said the sanctions "would only damage relations", after the country's Prime Minister said he was "truly saddened" by the incident.
Turkey has released an audio recording of what it claims are warnings given to a Russian warplane before it was shot down near the Syrian border.
According to the Turkish military, the Russian SU-24 attack aircraft was hailed 10 times before it was engaged and brought down on the Syria/Turkey border.
"Change your heading south," a voice says in English through heavy static in the clip.
The surviving Russian pilot, Captain Konstantin Murakhtin, insists that he did not receive a warning beforehand.
Captain Murakhtin was rescued and is currently at a Russian air base in Syria but his co-pilot was reportedly killed by militants on the ground.
Turkey has shown it is willing to take on Russia after downing a Russian fighter jet.
This incident will leave the American military profoundly alarmed that the Syrian conflict is now threatening to spiral out of all control.