Russia’s President Vladimir Putin has apologized for the fact that an Azerbaijan Airlines flight crashed after entering Russian airspace in Grozny, Chechnya on Wednesday, but did not say that Russia was responsible.

Russian President Vladimir Putin apologized to the President of Azerbaijan for the crash of the civilian airliner that killed 38 people, the Kremlin said Saturday.

On 25 December, 38 people died when an Azerbaijan Airlines flight, which had been due to land in Russia, crash-landed in Kazakhstan. The circumstances around the crash remain unclear, but limited evidence so far suggests it may have been hit by missiles fired by a Russian air-defence system as it tried to land in Chechnya.