Report: Ukrainian S-300s Gain First-Ever Kills: Shoot Down Two NATO Aircraft Accidentally Over Romania
Perhaps the most notable precedent was the downing by an older Ukrainian S-200 system of Siberia Airlines Flight 1812 over the Black Sea in October 2001, which killed all 78 civilians onboard.
https://militarywatchmagazine.com/article/ukrainian-s-300s-gain-first-ever-confirmed-kill-shoot-down-two-nato-aircraft-accidentally-over-romania