Turkey has shot down a Russian warplane that is said to have strayed into its airspace bordering Syria.
Turkish officials claimed that F-16s brought down the plane, after warning the pilots about the violation ten times within five minutes, on Tuesday.
A Turkish military statement read: "Our two F-16 planes on air patrol duty intervened in the plane in question on November 24, 2015, 9:24am, according to the rules of engagement."
However, Russia said that a Sukhoi Su-24 crashed within Syrian territory due to firing from the ground.
The Russian Defense Ministry was quoted by Interfax news agency as saying: "The plane stayed exclusively above the territory of Syria throughout the entire flight.
"Efforts are being made to ascertain what happened to the pilots.
"According to preliminary reports, the pilots have managed to self-eject."
Syrian Observatory for Human Rights (Sohr) said the Russian jet crashed in the Jabal Turkmen area of Latakia.
"It is still unknown the fate of the pilots who landed in the Turkmen mount near the borders with Eskendaron after targeting their warplane which is considered as the first Russian warplane to be targeted in Syria." Sohr added.
Al Jazeera reported that one of the two pilots was captured and killed.
Russia began attacking militant groups in Syria that are working against President Bashar al-Assad, in September.
Though the country claims that it is targeting terrorists, opponents have been accusing it of targeting the groups supported by the West.
Turkey has been an opponent of al-Assad's Government.