Azerbaijan on Sunday paid tribute to the pilots and passengers of the Azerbaijan Airlines passenger plane that crashed in Kazakhstan killing 38 people after Russian air defences were used against Ukrainian drones.

Four sources with knowledge of the preliminary findings of Azerbaijan's investigation told Reuters that Russian air defences mistakenly shot it down.

Russian President Vladimir Putin said Saturday that Russia’s air defense systems were active when an Azerbaijan Airlines flight attempted to land in Grozny, Chechnya on Wednesday.