The Turkish military shot down a Russian jet that it says violated its airspace on Tuesday.
Turkey says the plane didn't respond to repeated warnings.
The jet was carrying two pilots, who reportedly ejected with parachutes. Turkmen rebels in Syria, who have close ethnic and historical links to Turkey, say they have shot both pilots dead.
Russian President Vladimir Putin called the act a "stab in the back" and disputed how the plane was shot down — Turkey says the plane was intercepted by F-16 fighter aircraft in Turkish airspace, while Russia says the plane was destroyed over Syria by a Turkish surface-to-air missile.
Here's video footage of the plane being shot down:
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