By Guy Faulconbridge, Andrew Osborn and Nailia Bagirova MOSCOW/BAKU (Reuters) -President Vladimir Putin on Saturday apologised to Azerbaijan's leader for what the Kremlin called a "tragic incident" over Russia in which an Azerbaijan Airlines plane crashed after Russian air defences were fired against Ukrainian drones.

Vladimir Putin admitted Saturday Russian air defense was working when an Azerbaijani Airlines plane tried to land in Grozny before crashing, while stopping short of claiming responsibility. The Kremlin said Putin apologized to Azerbaijani leader Ilham Aliyev over the “tragic incident” in a phone call,