You’ll have to consider it takes an American, who speaks English, and who has to have a “secret” security clearance, one month of AIT training on that system. We are training them to use it in Europe someplace, and we don’t exactly have a lot of instructors who know the system and speak Ukrainian or Russian. Do the math.
Sooner or later, we’re going to have to admit that a lot of our soldiers are getting vaporized over there holding Ukrainians’ hands operating these advanced weapons systems.
Just as I thought: You have no evidence.
I’d be checking the US military casualty lists for “accidental deaths”.