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, on Saturday, admitted that his country’s air defence was working when an Azerbaijani Airlines plane tried to land in Grozny before crashing, breaking the Kremlin’s silence as speculation mount that Russia may have accidentally shot the plane.

Russian President Vladimir Putin apologized for the plane crash in Russian air space on Christmas Day that left 38 people dead in a statement that said Russia was targeting Ukrainian drones over the plane’s planned destination at the time, but stopped short of taking responsibility.