A Tu-154 plane from Russia's Ministry of Defense vanished from radar screens at 05.40 a.m. Moscow time (02.40 a.m. GMT) shortly after taking off from the Black Sea resort of Sochi.
President Vladimir Putin has called for an investigation and declared December 26th a national day of mourning.
The source said the disappeared plane was heading to Syria's Hmeimim airbase.
"I totally exclude" the idea of an attack bringing down the plane, Ozerov said according to the state-run RIA Novosti news agency.
A Russian military plane with 92 people on board has crashed into the Black Sea on its way to Syria, Russian news agencies reported on Sunday, and it was unlikely there would be any survivors. The band planned to serenade Russian personnel in Syria on New Year's Eve.
Those Syrian government forces are now battling rebels opposed to Syrian President Bashar al-Assad.
The Ministry spokesman Maj-Gen Igor Konashenkov also said that "no survivors have been spotted".
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Most of the 84 passengers were members of the choir, along with nine journalists.
He said: "It was an aircraft of the Ministry of Defence, in the airspace of the Russian Federation".
Russia's Investigative Committee said a criminal probe had been launched to determine whether violations of air transportation safety had led to the crash.
The head of a Russian charity fund was also on board. The ensemble, informally known as "Russia's singing weapon", has about 200 members and has achieved a number of worldwide awards.
With Russian air cover, pro-government Iranian backed militias kept up pressure on rebels in southwestern rural fringes of Aleppo late on Saturday, rebels said.
"The bulk of the Russian Defense Ministry's civilian aircraft are Soviet-made Tu-154s".
Tu-154 took off from the Chkalovsky airfield, where passengers and luggage were carefully inspected and checked. Pilot of Tu 154 was part of this crew.