Russia's Defence Ministry stated that a Russian TU-154 military aircraft with 90 people on board, including 8 crew members and 9 journalists, disappeared off the radar shortly after taking off from Sochi.
Defence Ministry officials said "It is likely that it crashed in the mountainous area of the Krasnodar region."
Officials said technical failure and/or human error are being considered as the cause.
Russia's missing military aircraft
25 Dec 2016
Russian military aircraft crashes into Black Sea
Russia's Defence Ministry confirmed that a TU-154 aircraft crashed into the Black Sea; the plane was heading from Sochi to Russia's Hmeymim Air Base air base in Latakya, Syria with 91 people on board.
Russian Defence Minister Sergei Shoigu said the location of the crash had been determined and rescue teams had been dispatched.
The cause of the crash is yet to be determined.
26 Dec 2016
Terror angle being probed in Russian aircraft crash
Investigators said they are probing all angles, including terrorism as they try to locate the Russian TU-154 military aircraft that crashed in the Black Sea.
Officials found debris, bodies and fragments scattered over a large area; they said failure to report a malfunction could be indicative of a terror attack.
Meanwhile Syrian President Bashar al-Assad conveyed his condolences to Putin and Russian citizens.
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27 Dec 2016
Technical snag may have brought down the Russian plane
Transport Minister Maxim Sokolov said terrorism was not among the main theories, but did not rule it out.
The Russian government has increased security measures at airports.
30 Dec 2016
Russian crash: Officials say equipment malfunctioned
Sergei Bainetov, head of flight safety for the Russian air force said they have not ruled out terrorism.
He said "an act of terror is not necessarily an explosion."