A recent plane crash involving Azerbaijan Airlines flight 8432 in Kazakhstan has sparked allegations of a missile strike, raising questions about the potential involvement of Russian air defense systems.

It comes as the head of Russia's civil aviation agency says the situation in Grozny, the plane's destination, was "very complicated" at the time.

Experts say evidence in the Azerbaijan Airlines plane crash in Kazakhstan points to a possible midair explosion, not an encounter with a flock of birds.