The Kremlin on Thursday warned against speculating what may have caused an Azerbaijan Airlines flight to crash, killing 38 of the 67 on board, after an aviation expert said evidence indicated that a Russian anti-missile battery may have brought down the passenger plane.

The Embraer 190 crashed near the Kazakh city of Aktau while en route from Baku, the capital of Azerbaijan, to Grozny in Chechnya in Russia on Wednesday. The flight attempted to make an emergency landing about 1.8 miles from…