Putin declares Dec 26 day of national mourning over Russia's Tu-154 plane crash

A nationwide day of mourning will begin in Russia on Monday, December 26, to honor the memory of those perished in the Tu-154 aircraft crash over the Black Sea earlier on Sunday, Russian President Vladimir Putin said, Sputnik reports.

Putin vowed the causes of the plane crash would be thoroughly investigated.

"Tomorrow, a national day of mourning will be announced in Russia," Putin told reporters.