Some sources now suppose the Iranians indeed did not shoot 'personally' so to speak.
Instead the russian 9K330 Tor (Nato calls it "SA-15 Gauntlet") decided autonomously that the jet was a threat, and fired.
No human action involved apart from setting up this array.
"If the assumption is correct and an SA-15 Gauntlet was used, then we are dealing with the case of an autonomous weapon system that made its decision within seconds. As it says in Wikipedia: "Approaching targets can be automatically classified according to risk potential and combated without operator intervention."
Any stationed SA-15 system must have rated the departure as an approach. The official explanation of a "defect in the communication system" doesn't sound particularly reassuring. SA-15 systems are also used in Europe, in Greece and Turkey."
Speculation yet, of course.
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>^..^<*)))>{ All generalizations are wrong.
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