After an Azerbaijan Airlines jet crashed in Kazakhstan, speculation mounted about why the plane went down and whether possible Russian air defense action may have played a role.

Mobile phone footage circulating online appeared to show the Azerbaijani Airlines plane making a steep descent before slamming into the ground in a fireball in western Kazakhstan.

According to Euronews sources, the crash of the Azerbaijan Airlines plane flying from Baku to Grozny on 25 December was caused by a Russian surface-to-air missile that exploded nearby. Source: Euronews Quote: "Sources in the Azerbaijani government confirmed in an exclusive statement to Euronews on Thursday that a Russian surface-to-air missile was the cause of the crash of an Azerbaijani Airlines plane in Aktau on Wednesday.