Three of the eight circuits of the downed Su-24's onboard flight recorder were completely destroyed, said a Russian Air Force representative after the aircraft's black box was finally opened this week.

The rocket fired from the Turkish fighter hit the Su-24's tail where the flight recorder is located, said the representative.

The black box also revealed that the Su-24's final flight lasted about 40 minutes.

An examination of the black box is still underway. The Defense Ministry has promised to provide a full transcript of the onboard flight recorder's data by December 21.

The Su-24, which was taking part in Russian Air Force operations in Syria, was shot down by a Turkish fighter on November 24. Turkey insists the Russian Su-24 was in violation of Turkish airspace. Russia maintains the aircraft was in the sky over Syria, not Turkey.

The onboard flight recorder was opened in the presence of Chinese and British experts on the morning of December 18. The opening procedure was broadcast for journalists to witness.

In reaction to the downing of the Su-24, Russia has imposed sanctions against Turkey. The sanctions have introduced numerous prohibitions, including a January 1 import ban on a range of Turkish products.