"I prepared a letter to the Russian foreign ministry with my condolences. We have so much sorrow in our hearts because of this terrible news. Our thoughts are with mothers and fathers of those young men who were musicians," Krydee said.
"We hope that this was an accident and not a terror attack … We are really sorry. We stand together with all Russian people at this moment. Because Russian and Syrian people are really close," Krydee added.
The Russian Defense Ministry's Tu-154 plane disappeared from radar on Sunday morning, shortly after refueling and take-off from the Russian southern city of Adler, near Sochi. Fragments of the plane were discovered 1.5 kilometers (1 mile) from the sea shore of Sochi at a depth of 50-70 meters (164-184 feet).
According to Sokolov, the Russian authorities do not deem it feasible to introduce additional airport security measures following the tragedy in the Black Sea.
Monday is a national day of mourning in Russia.
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