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Russian soldiers stand to attention prior to starting their patrol along the Sochi shore the day after a Russian military plane crashed, on December 26, 2016. The Russian military plane crashed on its way to Syria on December 25, with no sign of survivors among the 92 onboard, who included dozens of Red Army Choir members heading to celebrate the New Year with troops. Russia's defence ministry said a body had been recovered from the Black Sea. / AFP / VASILY MAXIMOV (Photo credit should read VASILY MAXIMOV/AFP/Getty Images)

Russian soldiers stand to attention prior to starting their patrol along the Sochi shore the day after a Russian military plane crashed, on December 26, 2016.
The Russian military plane crashed on its way to Syria on December 25, with no sign of survivors among the 92 onboard, who included dozens of Red Army Choir members heading to celebrate the New Year with troops. Russia's defence ministry said a body had been recovered from the Black Sea. / AFP / VASILY MAXIMOV        (Photo credit should read VASILY MAXIMOV/AFP/Getty Images)

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TOPSHOT - Russian rescuers carry a stretcher with passenger belongings after a Russian military plane crashed in the Black Sea, on a pier outside Sochi, on December 25, 2016. The Russian military plane crashed on its way to Syria on December 25, with no sign of survivors among the 92 onboard, who included dozens of Red Army Choir members heading to celebrate the New Year with troops. Russia's defence ministry said a body had been recovered from the Black Sea. / AFP / STRINGER (Photo credit should read STRINGER/AFP/Getty Images)

TOPSHOT - Russian rescuers carry a stretcher with passenger belongings after a Russian military plane crashed in the Black Sea, on a pier outside Sochi, on December 25, 2016.
The Russian military plane crashed on its way to Syria on December 25, with no sign of survivors among the 92 onboard, who included dozens of Red Army Choir members heading to celebrate the New Year with troops. Russia's defence ministry said a body had been recovered from the Black Sea. / AFP / STRINGER        (Photo credit should read STRINGER/AFP/Getty Images)

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Russian rescuer boats patrol off the coast of the Black Sea city of Sochi looking for debris of a Russian military plane, on December 26, 2016. The Russian military plane crashed on its way to Syria on December 25, with no sign of survivors among the 92 onboard, who included dozens of Red Army Choir members heading to celebrate the New Year with troops. Russia's defence ministry said a body had been recovered from the Black Sea. / AFP / Yekaterina LYZLOVA (Photo credit should read YEKATERINA LYZLOVA/AFP/Getty Images)

Russian rescuer boats patrol off the coast of the Black Sea city of Sochi looking for debris of a Russian military plane, on December 26, 2016.
The Russian military plane crashed on its way to Syria on December 25, with no sign of survivors among the 92 onboard, who included dozens of Red Army Choir members heading to celebrate the New Year with troops. Russia's defence ministry said a body had been recovered from the Black Sea. / AFP / Yekaterina LYZLOVA        (Photo credit should read YEKATERINA LYZLOVA/AFP/Getty Images)

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TOPSHOT - Russian rescuers carry a stretcher with a body recovered after a Russian military plane crashed in the Black Sea, on a pier outside Sochi, on December 25, 2016. The Russian military plane crashed on its way to Syria on December 25, with no sign of survivors among the 92 onboard, who included dozens of Red Army Choir members heading to celebrate the New Year with troops. Russia's defence ministry said a body had been recovered from the Black Sea. / AFP / STRINGER (Photo credit should read STRINGER/AFP/Getty Images)

TOPSHOT - Russian rescuers carry a stretcher with a body recovered after a Russian military plane crashed in the Black Sea, on a pier outside Sochi, on December 25, 2016.
The Russian military plane crashed on its way to Syria on December 25, with no sign of survivors among the 92 onboard, who included dozens of Red Army Choir members heading to celebrate the New Year with troops. Russia's defence ministry said a body had been recovered from the Black Sea. / AFP / STRINGER        (Photo credit should read STRINGER/AFP/Getty Images)

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A woman holds candles at a memorial on a pier outside Sochi, on December 26, 2016, as Russia observes a national day of mourning a day after a military plane carrying 92 people, including dozens of members of the Red Army Choir, crashed in the Black Sea. The Russian defence ministry told agencies there was no sign of any survivors at the crash site and that 10 bodies had been recovered off the coast of the resort city of Sochi, as authorities pledged to dispatch an additional 100 divers to aid in the search. / AFP / VASILY MAXIMOV (Photo credit should read VASILY MAXIMOV/AFP/Getty Images)

A woman holds candles at a memorial on a pier outside Sochi, on December 26, 2016, as Russia observes a national day of mourning a day after a military plane carrying 92 people, including dozens of members of the Red Army Choir, crashed in the Black Sea.
The Russian defence ministry told agencies there was no sign of any survivors at the crash site and that 10 bodies had been recovered off the coast of the resort city of Sochi, as authorities pledged to dispatch an additional 100 divers to aid in the search.
 / AFP / VASILY MAXIMOV        (Photo credit should read VASILY MAXIMOV/AFP/Getty Images)