Russian President Vladimir Putin on Saturday apologized to his Azerbaijani counterpart for what he called a “tragic incident” following the crash of an Azerbaijani airliner in Kazakhstan that killed 38 people.

The plane was flying on Wednesday from Azerbaijan’s capital of Baku to Grozny, the regional capital of the Russian republic of Chechnya, when it turned toward Kazakhstan and crashed while making an attempt to land. There were 29 survivors.

In an official statement Saturday, the Kremlin said air defense systems were firing near Grozny due to a Ukrainian drone strike as the plane attempted to land, but stopped short of saying one of these hit the plane.

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According to a Kremlin readout of the call, Putin apologized to Azerbaijani President Ilham Aliyev “for the fact that the tragic incident occurred in Russian airspace.”

On Friday, a U.S. official and an Azerbaijani minister made separate statements blaming the crash on an external weapon.

Friday’s assessments by Rashan Nabiyev and White House national security spokesman John Kirby echoed those made by outside aviation experts who blamed the crash on Russian air defense systems responding to a Ukrainian attack.

Neither Kirby or the Azerbaijani minister directly addressed the statements blaming air defenses.

Passengers and crew who survived the crash told Azerbaijani media that they heard loud noises on the aircraft as it was circling over Grozny.

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